Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f652083a4d37931…

MALICIOUS

PDF

43.7 KB Created: 2020-10-07 12:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6fabac9bdaf99f5a7b737406292d8eaf SHA-1: 85c063c9bf24df794b081cb9434523d0e462d455 SHA-256: 6f652083a4d379312ed2ae7c84d5ab130b8bc76d7ae3d40619579285dfc15fbd
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same lure text and URLs as the malicious redirector link, suggesting an attempt to trick users into clicking it. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=accenture+interview+questions+and+answers+for+freshers+pdf In PDF document text
    • http://sosoti.donbosco.amsterdam/uploads/1/3/0/7/130739415/jozosixamizaz.pdfIn PDF document text
    • http://rogozoz.westimartin.com/uploads/1/3/0/8/130814479/dubolisidivela_nidoba_kirobijisev.pdfIn PDF document text
    • http://files.gwentiscoed.cymru/uploads/1/3/1/0/131069839/jerewaragawav_bomelipazimiv_sanuwi_nubug.pdfIn PDF document text
    • http://files.barth-vader.com/uploads/1/3/1/8/131856382/dc1ea38d01af14.pdfIn PDF document text
    • http://vodomom.ctfarms-rabbits.com/uploads/1/3/2/7/132710635/xirapokuvudekut.pdfIn PDF document text
    • http://files.belizesportsoutreach.com/uploads/1/3/2/7/132740250/958f3.pdfIn PDF document text
    • http://zapiwag.mortgagepolicymanual.com/uploads/1/3/0/8/130874285/6ad04f004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4138/0769/files/fazomajagezitigotutom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1897/6932/files/memorial_hall_cincinnati_events.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0245/8022/files/lumber_tycoon_2_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2644/4199/files/tomtom_user_manual_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/nibetoxewikaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5206/3137/files/rituliridalibasejutimuzez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/9851/3831/files/double_letters_word_whizzle_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8244/1638/files/www.keytrain.com_run_career_ready_101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/cookie_clicker_achievements_challenge_mode.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6980 5476 bytes
SHA-256: a6ea484218f5e0bf48eee31e6f81013acfd35b78f0d5a7994bb41b2a4b67d3d6
font_01_sfnt_off00007c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 10336 bytes
SHA-256: ee60d903f2d9640dc342baee88e54d473a5be35908bfbd948f0f76407f1f3d34

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