Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9d6437c98c8e09…

MALICIOUS

PDF

43.7 KB Created: 2020-10-27 12:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1e60af49a16cb5afcc54e492702878a2 SHA-1: 158af1137da389072140ac1d822df7ad47b3f581 SHA-256: 4b9d6437c98c8e097435039f078eaf8d9d0caea7da6053949681b9ca4e432682
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to external PDF files. One of these links, https://gettraff.ru/strik?keyword=native+american+eagle+symbol, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious content.

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=native+american+eagle+symbol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f945620ed604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5f973ade3de5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f889b86c4333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5f95533f53a76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d83afa8-b067-4b12-982e-6d4511072cc0/detejejizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b911276-bc7a-4e2c-989a-258440a41afa/40990821062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be44523a-c186-4916-a2b7-c26aeca94468/58762029172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f8d7fd-2c57-45a0-8547-3d9b681170a3/wukavotamopola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/tylenol_500mg_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4250/5382/files/97415841071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6953/4108/files/sebastian_10_heart_events.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/74991315232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8843/6118/files/little_giant_pump_vcma-20uls_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/41650677699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0969/1807/files/brain_integration_therapy_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/85499810675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2992/9377/files/fundamentals_of_the_faith_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/rukofuxikoniradirajoj.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/vinusizo.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/sovijuvonegowikafokijuru.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/1325602315.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_off00006c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6D 5392 bytes
SHA-256: de0113dcd7f4b59c82a2ecc9da2e209479e8c1f846aa61fe0ca6b5ccbd24bb00
font_01_sfnt_off00007eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB6 10064 bytes
SHA-256: 68607b59e3a796baa041f3286749e2de5b05e1a03281d02480edbf11d1df242b

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