Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d74e85abdf434d…

MALICIOUS

PDF

35.9 KB Created: 2020-08-22 15:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a69801ac1f109d0e8bbb69d43212103b SHA-1: 52a13e5256c7a8384a48493ab7329e5bfd2cdaa2 SHA-256: 20d74e85abdf434df91beca5ae78c3b51d7921774c5e79e38fcef8c620a4fce0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains embedded URLs that point to potentially malicious infrastructure, including a redirector at 'ttraff.ru'. This suggests the primary purpose is to lure users to external sites.

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=janatha+garage+dialogues+videos
    • http://pelulovij.appmarc.com/uploads/1/3/1/0/131070450/povezewevipupir-puvasu-bokovivuvuduxo.pdf
    • http://files.theneuromuscularcenter.com/uploads/1/3/0/7/130776749/zimunimixubobaj-zoligifoxopo-loteku.pdf
    • http://robuje.standtallbakeshop.com/uploads/1/3/0/9/130969685/mefemepege.pdf
    • http://fofomiw.brattleborocjc.org/uploads/1/3/1/4/131454521/potewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/barron_s_sat_book_29th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/zonogoxirovezajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/60630720348.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/96012145402.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/84253554777.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/anonymity_in_research_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/flow_cytometry_principle.pdf
    • https://cdn.shopify.com/s/files/1/0437/2027/8171/files/musunaxufutonakas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/ragijurevibobinejodos.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/7417416118.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_off00005054.bin
d3e5a3c4bc4530ec83cc2a8079eeea88cf436d8b3294faccc2d8c60ea0b30c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5054 5136 bytes
font_01_sfnt_off000061c0.bin
22a355ef823b7ee56f8c0ce34596d4c8317daa3724fc2f12e265fc32908b26b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 9788 bytes

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