Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dfca1db5713252…

MALICIOUS

PDF

36.6 KB Created: 2020-10-07 13:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ee6576aab17d2828eba3f2e2ffab0c0 SHA-1: a3fd5bde9d960098a2b1328b98b31aa7dbfece74 SHA-256: a6dfca1db5713252f16bf5be2922357edf4483bb0eb2924e3559399ece2d0b20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to what appears to be a link farm designed to drive traffic to a malicious redirector. The primary malicious URL identified is https://gettraff.ru/strik?keyword=oklahoma+forensic+center, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to Shopify-hosted PDFs, suggesting a lure to a malicious site.

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=oklahoma+forensic+center In PDF document text
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130873849/12cfd20567.pdfIn PDF document text
    • http://files.adventurewithdiabetes.com/uploads/1/3/0/9/130969855/toxozovafadanirekope.pdfIn PDF document text
    • http://files.ramorean.com/uploads/1/3/0/8/130874114/770809cc4e2.pdfIn PDF document text
    • http://wagiriso.mwbands.com/uploads/1/3/1/4/131407558/7259155.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/28198307144.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/xanusorokadeguwa.pdfIn PDF document text
    • https://site-1036861.mozfiles.com/files/1036861/jiwanodazu.pdfIn PDF document text
    • https://site-1038599.mozfiles.com/files/1038599/59191036756.pdfIn PDF document text
    • https://site-1037844.mozfiles.com/files/1037844/21160522490.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/10092307820.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/1/0428/2525/3023/files/the_champions_mind_how_great_athletes_think.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/96012797831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/11333919819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8077/7373/files/farmers_of_salem_county.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6056/2582/files/35877511170.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_off0000526d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x526D 5212 bytes
SHA-256: ab37a59c66d074f582e8bf1ccb7634b224e542438a83a53d1f5bab836602176e
font_01_sfnt_off00006401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 9888 bytes
SHA-256: 44081520f51f2e45fdc034a46cb1b3c07bf1dab4caf336e479fc14575ebc7157

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