Malicious PDF — malware analysis report

Static analysis result for SHA-256 916dbea3f3b75e33…

MALICIOUS

PDF

38.1 KB Created: 2020-08-05 10:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab15069cf4060e0811ffe135b3ed7932 SHA-1: ad13493252240c6daa1745a4d21c8763e80f58d1 SHA-256: 916dbea3f3b75e337cf656c1742a14007f0b85fb3b4494a2542385622d2818b3
150 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary link, 'https://ttraff.ru/pify?keyword=oxford+business+english+dictionary+for+learners+of+english+pdf', is identified as malicious. The document body, though heavily obfuscated, contains references to the same URL and appears to be a lure for a dictionary PDF, suggesting a social engineering attack. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm or SEO poisoning attempt to distribute malicious content.

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=oxford+business+english+dictionary+for+learners+of+english+pdf
    • http://files.doublefarley.com/uploads/1/3/1/6/131636678/1750789.pdf
    • http://rofom.premierbeachpropertymanagement.com/uploads/1/3/0/8/130874317/3667199.pdf
    • http://tetutude.ondragonwingsstudio.com/uploads/1/3/0/7/130739590/9f2f13.pdf
    • http://files.pdxprays.com/uploads/1/3/1/4/131408572/wefotobato_purajisagis_wumusapovewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/bijobomukuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/35699593314.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/4888754933.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/84962385554.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/bash_string_manipulation.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/bisafelajaduke.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/lemonaboxupelina.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/eragon_s_guide_to_alagasia.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/nolurozo.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_off0000542a.bin
b5c25d7a3f1ec90cbee11b347a34ee0a16c52f21da33d2d5e03e32bba6e78fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x542A 5752 bytes
font_01_sfnt_off000067c5.bin
59fb09a5e7e04cbc9ceee014bb4bff07f87ae0791e0ba844eb8403605d263008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C5 10332 bytes

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