Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce48066fb136b60…

MALICIOUS

PDF

79.6 KB Created: 2020-11-14 10:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f91d4e1763e459c03cfbde78fae1532 SHA-1: 199dda60893be5398e460f2ce539641867c4e5f6 SHA-256: 3ce48066fb136b60014ecc2d10ef698d910f3ee59b36d6ccdff6c17c414fd9de
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, appears to reference academic content ('Netacad chapter 10 exam answers 2019') to disguise its malicious intent. The presence of a link farm and a redirector strongly suggests an attempt to lead users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=netacad+chapter+10+exam+answers+2019
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5fa0e355e2933.pdf
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f9154dfdf4e4.pdf
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f870fd8ea46b.pdf
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f978a2bd19d3.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f873dd029b4f.pdf
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5f95f2522686d.pdf
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f8f790f85468.pdf
    • https://jipunelokafup.weebly.com/uploads/1/3/4/1/134109215/db4a3cbce06fc52.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/90d74a57-54c0-42ff-a2f9-bbf2044ec31a/kapawa.pdf
    • https://uploads.strikinglycdn.com/files/3cd900af-8138-4f24-a7a2-a4ff7eb61e48/fubelirewewazegagujamex.pdf
    • https://uploads.strikinglycdn.com/files/0319e8d7-4086-49fe-8524-0eafdf43bcb0/greek_myths_about_love.pdf
    • https://uploads.strikinglycdn.com/files/d5ccdcd9-6926-4bcb-956e-fd27dee73295/99531914623.pdf
    • https://uploads.strikinglycdn.com/files/e42b5312-7f90-4eee-a4bc-3f82eabf3cc4/98373181807.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edda.bin
61e3a4f5557020fa636b5df95de98fe4fe907bdd3a4479b3ef4ab3f19946f505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5524 bytes
font_01_sfnt_off00010087.bin
a0da9e4786dd970404179e29bbcb5206a36a2bf53a12e61d0e7d87d1d2e81c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 10224 bytes
font_02_sfnt_off00012341.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 4324 bytes

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