Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cc383441965236…

MALICIOUS

PDF

41.9 KB Created: 2020-08-06 19:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b04c3db70a1158fa06735d35aecbcaa9 SHA-1: b917371ceeebd1608eea2dc5e6b1f0e5a1f43c81 SHA-256: c0cc3834419652365f5a8d42a116459d61ea6da7ea2b788fa0ef8b1218c15974
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, contains the URL that is likely intended to lure the user. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, designed to distribute further 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=synonyms+worksheets+for+grade+2+pdf
    • http://files.theanglehomestead.com/uploads/1/3/1/4/131407465/5b6ef2fa8d749.pdf
    • http://files.cmrcsystems.com/uploads/1/3/0/7/130738792/652aa1.pdf
    • http://files.yogaatschools.com/uploads/1/3/2/6/132682966/70db8aa358f9c.pdf
    • http://files.gaithersburgpickleballclub.com/uploads/1/3/1/8/131871571/jolelo-rekakopagome.pdf
    • http://motovo.lekeapenawriting.com/uploads/1/3/1/4/131453177/3b8a5aff.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/12174187126.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/50068644811.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/13407328517.pdf
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/slader_stewart_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/mokifoduzepaseguwe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4693/4430/files/42540197184.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44628440260.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/kufupekat.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/schwerbehindertenausweis_antrag_rlp.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/lapatetowajaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/56436226224.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_off000063bb.bin
44bc7cf360f3b232e2013909be3b928837782319929a7b9c8446470a326806a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 5916 bytes
font_01_sfnt_off000077d3.bin
848d68daab27af6b6fbb20faadd4c77c6d22739da9d860b2034975b53d714167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D3 10296 bytes

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