Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ff29795667ceab…

MALICIOUS

PDF

73.6 KB Created: 2020-11-04 05:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b8fed0f3a35c11605cc6d9e9b5572f97 SHA-1: b74b6a7c9b9530c2263e60dbac754363d98550eb SHA-256: 94ff29795667ceabc0d44e11e3bfee164906fcded1112998e7c71d3ff2149ad9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as an exam answer key. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cctraff.ru/wb?keyword=aipmt%202014%20answer%20key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f9b27ca8d7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f9994b0be63d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f915dff8da95.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/2372498566.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/16035121054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9436b1-4ce8-4afd-8e5a-5a4f18e11a2b/wasipuduf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/xupalojumolobatir.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/malt_liquor_vs_beer_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/2020_1040_estimate_due_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/jukodipazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b46ed5-3e83-448a-aa8f-e6bef49df9bf/naxomejofukojaravud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70aa391-aa1d-490b-928c-769fa5b296df/scorpion_king_2_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d203d9c5-2d64-45d7-a210-da338260cab7/nemogisakexawesesan.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/40850378488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2235/9447/files/93909674965.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/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000967f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967F 7976 bytes
SHA-256: 993627554908988efb4c526a5eb7e21d90caaf9ada0fe913e4b6b708379ec6a4
font_01_sfnt_off0000ad7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7D 5596 bytes
SHA-256: d4d9cfabe6a7ecc515f9cb29edf5e9cdc64f72a64ab2183edd2f2ec292fa5359
font_02_sfnt_off0000c09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09F 8976 bytes
SHA-256: e6ef1070fe110e09fdf6bef938d0dd901ba4047105bbf626610727e05d38d2aa
font_03_sfnt_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 2152 bytes
SHA-256: 9e87d7586df076ba4c537ecf148ce621fe7c06bbcaaad9ae0df27ab08f500043
font_04_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 11652 bytes
SHA-256: 54fd31314997ae317c58ae7c3191fcaf7ef352a098093cc4d39e067a4cb5904f
font_05_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16064 bytes
SHA-256: f16cd67867b18cdd623629dc4245b8d8861c8210ed70bc0bf2a09e14863ad9d6

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