Malicious PDF — malware analysis report

Static analysis result for SHA-256 c857a68de6f06930…

MALICIOUS

PDF

48.3 KB Created: 2020-08-20 21:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2481e4f87a717e655d7d9f13c38b8c6c SHA-1: cd6d19be7282569716f31d0d1f8663cad94b96d8 SHA-256: c857a68de6f0693051a82221c574218028316d1a63ed013cdeb3b21a16b8e6ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=1080p+movies+highly+compressed'. The document body also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous links to other PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for the attack pattern.

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://ttraff.ru/pify?keyword=1080p+movies+highly+compressed
    • http://pazuganu.coplanvineyards.com/uploads/1/3/1/6/131607240/451946.pdf
    • http://files.damiancowell.com/uploads/1/3/1/4/131454521/nunukiwenodufu_bedetixamezufor.pdf
    • http://files.thecatspyjamastrio.com/uploads/1/3/1/8/131856173/joxepudopakus.pdf
    • http://files.saintjosephsculturalcenter.org/uploads/1/3/1/8/131871568/3cb3d.pdf
    • http://files.barambah-beekeepers.org/uploads/1/3/1/3/131380213/6bd8441.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/demekerunomezesaduro.pdf
    • https://cdn.shopify.com/s/files/1/0435/6174/6595/files/turn_off_automatic_sign_in_gmail_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/gewezinolavuvokase.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/94113838592.pdf
    • https://cdn.shopify.com/s/files/1/0432/6070/6971/files/23513568061.pdf
    • https://cdn.shopify.com/s/files/1/0434/2484/1890/files/2139903639.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/kixiwixene.pdf
    • https://cdn.shopify.com/s/files/1/0461/6500/0344/files/revedivuxopafovejiwe.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/48070959134.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/80072126548.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067fc.bin
e4192e1f359fc04b389ddbd6a5fbc398a874b42673a818f32d17ee59a19048e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 5732 bytes
font_01_sfnt_off00007b58.bin
5bc0c2aabb025ec97b2623b8a447dfe35b1ddd371c4fb38edfeb6230ed349a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B58 10348 bytes
font_02_sfnt_off00009ed3.bin
3a7d25cc37f3ad8db9e8a7fc5b2c94d7797cff121feeb8d7d464cc6310a89da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED3 16208 bytes

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