Malicious PDF — malware analysis report

Static analysis result for SHA-256 40101d791d46bd54…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 03:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7a18dfc7f451a4f48467b3fe55428f SHA-1: c9befe4e058dfe32728acda760fd16b80fd4e463 SHA-256: 40101d791d46bd54a905f38557edc7e59ea4bbaf75b98bd10a0bc04e803fdff8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=anemia+perniciosa+pediatria+pdf'. This indicates the document's primary purpose is to lure the user to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, but the presence of a malicious redirector is sufficient to classify the attack pattern.

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=anemia+perniciosa+pediatria+pdf
    • http://files.laurentrimble.com/uploads/1/3/1/4/131407051/3936746.pdf
    • http://files.earltoddbbq.com/uploads/1/3/1/4/131437464/79efd0cb.pdf
    • http://files.mattblackhall.com/uploads/1/3/0/9/130969820/74696963fbb50c.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/72254018079.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/alphabet_activity_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/aci_318_14_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/concierto_barroco_alejo_carpentier.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/manumisojejojebemapute.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/sigaveravigusofefazik.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/zarefuratewasiladiguw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/fevomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/49437979352.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/tutorial_dreamweaver_cs6_lengkap.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_off0000684a.bin
4a5e9b355354889c6e5c11d21c342856b5775bfa9905eaaeaec606c08c334519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 5260 bytes
font_01_sfnt_off00007a0e.bin
6c598e4c995621528e1e6721b62bd14d8dbce050e7325c054d6df4b965ec15a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0E 10728 bytes

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