Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7055c745c5ca886…

MALICIOUS

PDF

35.0 KB Created: 2020-10-26 21:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d8eeacab3d9cb442749aec69de9ee276 SHA-1: 4fe4ebff7155c63e6db89004357b00e17ca83ef2 SHA-256: a7055c745c5ca8862a43cad7dd354d15d74b82daa691c616c44ade5067c4cf2a
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a manual, likely intended to trick the user into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.
  • 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=samsung+sensor+dryer+manual In PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/nememosesepeg.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/gebisuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_5f963e68d0486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5f91557b92131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f8b8166ccb95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/wakafogedugudaduxukibe.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/nubojawolomasos.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/counterfeit_gods_timothy_keller.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/55918625271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3a5ac9-6569-4fb9-8909-046bfe8a0078/gagelaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a43b94-cae8-439d-94c1-327f817cff48/vomok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d350de4e-73b0-4ad4-9233-bf2e02b914b8/zevonoted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0885bfc6-9c40-44b0-aed2-ef376feec15b/rawabowutot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc525c2-7891-4c55-a812-37173045e157/topeseluvupedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2c20f2-8066-4f39-8417-0970fefc79f1/42080512963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541beb6b-99e9-4010-a275-b52e36a8bf13/posimigipuliti.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B87 5352 bytes
SHA-256: 1bfcea709c704712b133f0e76434e5857b27dbf1f909f1bead44dfe8b2ea3348
font_01_sfnt_off00005d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9D 9820 bytes
SHA-256: 0208754d5b74674db704124d1103e2cee5c536d323f76043bb73e9d0b73ce59f

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