Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafe8c662f91846b…

MALICIOUS

PDF

52.8 KB Created: 2020-08-05 11:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05ca7350afb62f4b947a8a1cd2051935 SHA-1: c9c1109387cbd07fbcd85fb39a77f2b05fbdd919 SHA-256: bafe8c662f91846b37df877f2f17309dad9de0e00cb088b72e56f8dde9e8d9ee
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The primary link, 'https://ttraff.ru/pify?keyword=causes+of+aggression+in+social+psychology+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly supports the malicious nature of this PDF.

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=causes+of+aggression+in+social+psychology+pdf
    • http://files.bullengarookadultriders.com/uploads/1/3/2/6/132681596/fomapofegaro-wopigadazodup-zevevamer-tirexilagenizo.pdf
    • http://files.graceevangelical.org/uploads/1/3/0/8/130814234/8316525.pdf
    • http://files.willowfree.ca/uploads/1/3/0/7/130740344/xiwodufa.pdf
    • http://files.inspiredbygeology.com/uploads/1/3/1/6/131636872/rowonigex.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/tikorovarevuroxunej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/waxuvirojesiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/gamabebivavolalusemit.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/lazimukidek.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/texas_vehicle_inspection_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/tepaxarisixavaxi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/64499822112.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/27885822231.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/razikeruranofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botudurodakokebavexosox.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/codex_adeptus_custodes_8e.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_off00009043.bin
5676237fd5f7052c9ba87b6d17bebd373f01caee23a90a50fcf4cac0dc5c00cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9043 5424 bytes
font_01_sfnt_off0000a2b6.bin
46e053dd074cf78a4495a58337b238de0629ed22c8c401455048bee010f07940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B6 10316 bytes

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