Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb76ce432f7f0b31…

MALICIOUS

PDF

34.8 KB Created: 2020-10-02 07:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c805cbad351bde700eef43e06e33e05c SHA-1: d819f6fdb0dae5feb4005135faf92e1e1b8cdc7b SHA-256: bb76ce432f7f0b310a68f9880383d83490d4fd7c118e690d00c41c1f1816a977
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://gettraff.ru/strik?keyword=keys+of+this+blood+malachi+martin+pdf, which is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites.

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=keys+of+this+blood+malachi+martin+pdf In PDF document text
    • http://files.goldeneaglesweden.com/uploads/1/3/0/8/130874588/4569246.pdfIn PDF document text
    • http://livepap.fordandfordins.com/uploads/1/3/0/8/130874038/siratu.pdfIn PDF document text
    • http://files.vietaggies2017.com/uploads/1/3/2/6/132682035/narirav-zakikizeremosib.pdfIn PDF document text
    • http://gujofim.uptomogood.com/uploads/1/3/1/8/131856427/xineziwaw.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/b22e5809-522b-4948-af8a-5369c3609eda/judumoraso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163d4fdb-bc96-4769-8f76-394fe3b9cdad/27347014705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e88561-f747-4d18-96af-b1e8814a41b5/55817324935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a97b7ae-e29c-416d-aa69-b6b29bd8a012/rinop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4590/7349/files/22240167215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/6761/5648/files/10437826470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0601/2824/files/whirlpool_duet_steam_dryer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5552/0675/files/rock_songbook.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_off000049e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49E4 5608 bytes
SHA-256: dcf4a1f40aadae185e7d3cf33a8f5c19f56ea24014928d8cf323e4a2cbf7fa15
font_01_sfnt_off00005cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD1 9952 bytes
SHA-256: 943d2e877b536d974a495c44800df5599aad8c5637684d2b41568ba0205087b4

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