Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7adeda789c7aa2c…

MALICIOUS

PDF

65.4 KB Created: 2020-08-26 18:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b733f85234ea249671040002141ca4bc SHA-1: be6489d8250a8e14f471791fadb2f8c57e8e0981 SHA-256: f7adeda789c7aa2cefc35680a2ca320cb394e293d83565d03d2ceec91e92c034
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=applied+statistics+and+probability+for+engineers+pdf`. Additionally, it exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, many hosted on `cdn.shopify.com`. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL and a reference to a book title, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=applied+statistics+and+probability+for+engineers+pdf
    • http://files.lucygorman.com/uploads/1/3/1/4/131407647/eca27.pdf
    • http://files.cheshiredem.org/uploads/1/3/2/6/132682820/6151629.pdf
    • http://files.lotusenergyandmassage.com/uploads/1/3/1/8/131856290/9914773.pdf
    • http://files.cheshiredem.org/uploads/1/3/2/6/132682820/61516
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/48259359465.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/nupesosus.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/48081889369.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/17100594060.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/fowipu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/rosoxotefixapode.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/sp_sp2_sp3_hybridisation.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/40589081488.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/11296210697.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0261/files/wojebagozipafiropedimolag.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/72294632032.pdf
    • https://cdn.shopify.com/s/files/1/0450/3525/8020/files/chadariya_jhini_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/56622582978.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c2c9.bin
50ec90415f236ce722aedc5edc6287c94ced8369d815677976cda44771d6c7b1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC2C9 20940 bytes
font_00_sfnt_off00008505.bin
6fd516c35f3db74bbeb83eb40fe91137516bed04c2c02a15fbc99e410d400def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8505 5340 bytes
font_01_sfnt_off00009734.bin
0829d2407c536f455f9020519543f360689d5cbb7be7298d461500a3435d1c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9734 13960 bytes
font_03_sfnt_off0000e6db.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 4324 bytes

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