Malicious PDF — malware analysis report

Static analysis result for SHA-256 739211c26a161e04…

MALICIOUS

PDF

44.8 KB Created: 2020-08-24 12:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b79387337109beed3cfb7e96949ec2 SHA-1: 6ad8bffe92fd57ca314ff16c333378506ac9b713 SHA-256: 739211c26a161e0492ddb55275161f41bdee8cc0f7ed2c2a17493f2e01da1e22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it contains a mass external PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the true destination or leverage benign-looking hosts. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=guided+by+voices+box+discogs
    • http://mewop.greallywardick.com/uploads/1/3/2/6/132681862/8141471.pdf
    • http://gilaf.kellerdesignbuild.com/uploads/1/3/0/7/130775904/9fe96895f2a28.pdf
    • http://files.twelvepaths.com/uploads/1/3/0/8/130814208/vafiparozepu_xitixiran_tadujo.pdf
    • http://files.leaderofpeace.com/uploads/1/3/0/8/130874205/b02590efe95bce0.pdf
    • http://guxodi.latoursalon.com/uploads/1/3/2/6/132695471/luxule_kamagomifomola_gigiten.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/6969/0276/files/zirusibifuxoxufijutojeje.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/wunemidunoxatapuvobi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/sugamuxujavev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/lifesiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/holistic_nursing_scope_and_standards_of_practice.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/best_all_weather_tires_2018_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/rogavokisebamikewagir.pdf
    • https://cdn.shopify.com/s/files/1/0438/1124/2144/files/marikatupavitamudap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7014/files/progressive_bulbar_palsy.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/botizutukubudag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/34675439498.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e5.bin
d5adcff5f47febd8c52c830d468989e46db7457b7eb76d677956bca36d34974d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 5172 bytes
font_01_sfnt_off0000769a.bin
fc358c45e2b06cd0a24aa05284113554b2b64ea14390d127214b98caae855ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 15488 bytes

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