Malicious PDF — malware analysis report

Static analysis result for SHA-256 398f4b179bc8c4a9…

MALICIOUS

PDF

42.7 KB Created: 2020-08-15 00:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4ebfc1c755800572cb639db4bd9e662 SHA-1: 2093e4a4e8a6d2ebebd4defd982e68d7e9021ba9 SHA-256: 398f4b179bc8c4a9d84a898e2b579d4f41483af745bf8cd760ea794fefb167b4
150 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a malicious redirector, disguised as a planting guide. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.com/pify?keyword=lambs+ear+planting+guide. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the lure text and the malicious URL.

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.com/pify?keyword=lambs+ear+planting+guide
    • http://files.vancouverminiatureshow.com/uploads/1/3/1/4/131409508/7539949.pdf
    • http://files.gammadiamonds.com/uploads/1/3/1/4/131410606/kakujuv.pdf
    • http://files.linhallen.com/uploads/1/3/2/6/132681992/bda91e.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/14181123910.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/gesarom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/32942897718.pdf
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/28424001203.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/carrier_chiller_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/jizobufogapivabosekipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/kanumetegaletipisebi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5468/5599/files/55416741673.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4567/files/zirusigiwetamebilib.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/acta_constitutiva_de_una_sociedad_anonima_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/fadigubejuvuxenuwagukew.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/wunojufam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681c.bin
19bf1d492c0e3c411f3f1ed9bad00c512de7f3131cc977a3d570c1a761e985dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 5360 bytes
font_01_sfnt_off00007a31.bin
15ec8c0498eabc27883271f5141f70d600de9cebc147c9d12e550f6355712b76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 10520 bytes

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