Malicious PDF — malware analysis report

Static analysis result for SHA-256 334411ff7235d705…

MALICIOUS

PDF

65.3 KB Created: 2020-10-04 23:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6bad4d38be2e736891df82b4129f5d3c SHA-1: 18a6c69e9de67876f0a82484e3241d4e84356447 SHA-256: 334411ff7235d705d04f5f2390efd945f1df7851b06181f4bc322bc59bc7af52
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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 1.0000

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://gettraff.ru/strik?keyword=descargar+diccionario+ingles+espa%25C3%25B1ol+cambridge+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5754/3328/files/temef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1725/9173/files/la_soupe_aux_choux_streaming.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/61361367320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ed8f6e-18a0-4ac5-97fb-668a4c6f8ff5/53872793542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718341b0-d752-4ea8-b1b6-000fedd9c6ef/8031855202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0016a77a-68bd-4fdd-902e-531e223a4684/11057269436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3554fae-cee2-4193-961a-f451b2dc407d/tudemajixilotivamatinatet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/debafaxuxipegarivupexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9428/8800/files/the_unit_theme_song_walk_the_fire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/80899226721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2775/9257/files/us_constitution_crossword_puzzles_intermediate_1_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7172/1638/files/ti_83_plus_emulator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/greystone_power_outage_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/4089/1029/files/bodawelulixutadaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/lezosuwisojajaxaso.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55EF 14360 bytes
SHA-256: 7a12bc07ae6a2251a18a6e93f830db1b841253b9e2d470370f337527b16ffb88
font_01_sfnt_off000084e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E0 5828 bytes
SHA-256: 47072fbfe08a4ecc96389693d89686cf014e19af43bc53051e6ab270553bd0a6
font_02_sfnt_off00009855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9855 8980 bytes
SHA-256: fdb916f05f4e943c8dcb94355a09fefe6c1a5204938a1258392802a6cff35766
font_03_sfnt_off0000b195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB195 11656 bytes
SHA-256: 5ba5cea55889548b1bd807dc52da3eef749a4dfe49ad4efadf8357e564c662e2
font_04_sfnt_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 18488 bytes
SHA-256: 6fdc74bbf8310c34c34870ddf74e604373efdfab32e3acc1a5f63537cd646837

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