Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ecf21dbcf509f3…

MALICIOUS

PDF

74.3 KB Created: 2020-10-27 03:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 93d61feffc5da26276e1efc56cc168b6 SHA-1: d946064b953bfc38c179a7f40cd9164143a4fa4c SHA-256: f3ecf21dbcf509f377d2bdd274e6b2b10a2a5f4e820b10e3b061a58d0af8c710
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/123?keyword=harry+plopper+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f8a491d40ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f90b17d50e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8c63af26a46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5f95ccfd4a147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f8a17cfc0164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/mubefula/concept_of_equality_in_political_science.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/the_arrl_handbook_for_radio_communications_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/cannonball_adderley_omnibook_eb.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/opposite_words_in_english_a_to_z.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/povemerivuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/mivekogenefavu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/72078609772.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/manorama_calendar_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/86217099992.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/vanidanodagexuviz.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/caustic_3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/79389789662.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/errterung_10_klasse_realschule_musterlsung.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/46443727459.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/capitalismo_tardo.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/edit_documents_without_adobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3218/4485/files/95864293576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7534/6847/files/real_bike_racing_game_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/kekezowox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3896/6438/files/69621650964.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 5016 bytes
SHA-256: 566bf90885ddf6e29b333ba0a0f3f619f5e18b2421299ebfb1be9c3ced60fde0
font_01_sfnt_off00007c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C84 5024 bytes
SHA-256: e8eaa5a3dc54470d9bc9f423d0796ba16ba23b19901552a654a660d17ddf6ab6
font_02_sfnt_off00008d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8A 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off00009890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9890 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_04_sfnt_off0000a347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA347 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_05_sfnt_off0000ad13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD13 6568 bytes
SHA-256: c37d749c9ed0614f5ac3304bd1ed6765d5830d661f7c148996890ed1b8a6acc2
font_06_sfnt_off0000be66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE66 18020 bytes
SHA-256: 5e5c8cc322ee92dff55893ba447bf75b44b97323029483d184aee9ba1017d76f
font_07_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17384 bytes
SHA-256: 061ce91e35e3ff666a42263877d6a01ee63850015661b621959d32860767e8e2
font_08_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 3276 bytes
SHA-256: 51c1d5fa29146058fbc649eac7766b85490f6942bd67486bd14cc46e9087474c