Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a8a90718bd50c3…

MALICIOUS

PDF

47.2 KB Created: 2020-08-11 18:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69bbc9c7cc79f225a2212d2fc93bce26 SHA-1: 78160554f2578718c71702748f9e76c4947f06b9 SHA-256: 96a8a90718bd50c3b55ad132feb230e2b407e5106da4662a11914f4007ff27be
120 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 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a lure for a PDF download, specifically mentioning 'Robin Hood' and including the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted from this sample.

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=robin+hood+oxford+bookworms+starter+pdf
    • http://files.neurosportchiropractic.com/uploads/1/3/0/8/130813827/ca9344a3275.pdf
    • http://files.ibstudyskills.com/uploads/1/3/2/6/132696263/vopajuwe.pdf
    • http://vaxeva.northbrookumcpreschool.com/uploads/1/3/1/8/131856158/misomarabozi-wusefubukajoxam-xazaruge-kanabiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/11001309596.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/sepifagarigigexilugakimo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/14781279814.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peposorutap.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/9400452343.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/govakox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/dikufotikiliwajojuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/wevefigubomojanad.pdf
    • https://cdn.shopify.com/s/files/1/0429/4675/6774/files/mathematical_puzzles.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/business_process_reengineering_articles.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_off000077dc.bin
ff08e1746f736e15915c971e2526408926e68553459bf71ab4f543c6455609eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DC 5620 bytes
font_01_sfnt_off00008ad3.bin
0aad0b05cc8977d0cf12adaa6731d95faeebb4f901bbf706bab6d33830183cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD3 11196 bytes

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