Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68214cf94736271…

MALICIOUS

PDF

86.8 KB Created: 2020-12-22 04:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f666d06d04002e41a76460f2f946fb SHA-1: 584f5a64a19cda357dc246c91047821931d8aa61 SHA-256: c68214cf94736271722d9c3aa57843b25d876849016d4cda73ba04eb628e310c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary malicious URL, 'https://traffmen.ru/strik?utm_term=math+flashcards+for+ipad', is a key indicator of malicious intent, likely serving as a gateway to phishing or malware. The presence of many links to S3 buckets and Weebly domains, some flagged as unknown reputation, further supports the link farm and potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=math+flashcards+for+ipad
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/dabuperabowugeve.pdf
    • https://fifowekuvepu.weebly.com/uploads/1/3/0/7/130776735/lomoxudodepajoniwes.pdf
    • https://getezulesu.weebly.com/uploads/1/3/1/0/131071231/e2974.pdf
    • https://cdn-cms.f-static.net/uploads/4448110/normal_5fab0de663ca7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/faxaxos/dagafe.pdf
    • https://s3.amazonaws.com/memul/36907969055.pdf
    • https://s3.amazonaws.com/fenatagazise/36514153515.pdf
    • https://s3.amazonaws.com/subud/articulacion_del_codo.pdf
    • https://uploads.strikinglycdn.com/files/d3756abd-7709-4d3a-a5c2-8f1f79b5e313/60015162393.pdf
    • https://s3.amazonaws.com/lokijuronig/advanced_inorganic_chemistry_notes.pdf
    • https://s3.amazonaws.com/satudifin/autocad_tutorial_2018.pdf
    • https://s3.amazonaws.com/levovod/canon_5d_mark_iii_manual.pdf
    • https://s3.amazonaws.com/napoledunadigo/nozokezenabafa.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74f.bin
076e72317974dcb42f9c3fffcae8c61fd81ee8b98ae2444084be1f356d8ad1e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 5248 bytes
font_01_sfnt_off0000e929.bin
13c537ecebc01ca8b05ae56d09bd86d047ac6c08dd091bf1a594dd21e7ee1a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 9584 bytes
font_02_sfnt_off0001045f.bin
c861e27703db4f10309b0988e52e4c51370a744fb82243fb4d26c15f926e225a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 11108 bytes
font_03_sfnt_off00012a5a.bin
1d3bea3489e9c344a17bd45386a566176900a7ac9668d10a174f3b03aea2e6a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 20516 bytes
font_04_sfnt_off00014575.bin
5f7498f8e433e4c6c47e8ca53e78f46c92ad2660f1d70c8a76bf58ffa4fc47b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14575 1740 bytes

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