Malicious PDF — malware analysis report

Static analysis result for SHA-256 4393b2789122759b…

MALICIOUS

PDF

41.0 KB Created: 2020-11-05 00:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10abec7ff660b983593257b920d3e5d6 SHA-1: 5e2c124f065d6c35a4f3bbb9013a45fecc48a757 SHA-256: 4393b2789122759bcb23f8f65f32c0c66b927e56822aeab760ba39132cc635f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to potentially harmful content.

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://ggtraff.ru/strik?keyword=list+of+inflected+endings
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f9661bb9957f.pdf
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5f9780cd574fd.pdf
    • https://karojigulad.weebly.com/uploads/1/3/4/6/134623473/guwurudinela-gegemupilu-vasexamarinu-xulumojebuk.pdf
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/1518935.pdf
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/mizeje.pdf
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/3737110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bawalidamovidud/96388809376.pdf
    • https://s3.amazonaws.com/tetazino/kevifegezewifomevobek.pdf
    • https://uploads.strikinglycdn.com/files/fe51b8a1-3524-4f01-bc77-aef1745ffcae/91076894573.pdf
    • https://s3.amazonaws.com/pazifetanegapu/lunigodevogikavew.pdf
    • https://uploads.strikinglycdn.com/files/c200cfc0-ac5b-4dae-81d5-ba4cb2bcb464/71137776290.pdf
    • https://s3.amazonaws.com/xisefowu/maine_vanity_plates_funny.pdf
    • https://s3.amazonaws.com/jozetej/zexarixixozigawip.pdf
    • https://uploads.strikinglycdn.com/files/5cdb4bc1-57e3-49ff-85f8-7faba15044fe/54793884482.pdf
    • https://uploads.strikinglycdn.com/files/7fc5e075-c689-40b0-8df3-3fbea8f424ed/17548727653.pdf
    • https://uploads.strikinglycdn.com/files/446897c7-1d86-4135-83cc-d497029125fc/dedekapidonakesizobetiti.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_off00006294.bin
9824f42ce3ab3bee47adae2d224b96d8073764f8607d0c3498aafdfbf6bde4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6294 4824 bytes
font_01_sfnt_off00007321.bin
8e52c22950fc2b1c38eca6621ad82e145ed8363a33683ad27d66259b57cccec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7321 10640 bytes