Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f23ce325af556f…

MALICIOUS

PDF

28.8 KB Created: 2020-10-31 04:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6420a05d9abf6156eec0810c19d672b9 SHA-1: 7b55999e3c8121c5f435f71b6aff543a2644692f SHA-256: f7f23ce325af556fa62523cdd89fde6f984fe2dc2c10312faca6adc53730612d
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document utilizes an image-based lure, a common tactic for phishing or malware distribution. It contains a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=systemverilog+for+verification', which is flagged as malicious infrastructure. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is part of an attack.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 28 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cctraff.ru/strik?keyword=systemverilog+for+verification
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/9902509.pdf
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8aadb7f31cc.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/658902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/249bb538-58f3-4d75-8e7d-7b26eabebae5/aportaciones_de_genichi_taguchi.pdf
    • https://cdn.shopify.com/s/files/1/0498/6473/6957/files/15314007018.pdf
    • https://cdn.shopify.com/s/files/1/0483/0615/9779/files/convector_electrico_nex_manual.pdf
    • https://cdn.shopify.com/s/files/1/0505/2078/5068/files/tokujebatox.pdf
    • https://uploads.strikinglycdn.com/files/436eb467-db11-4b23-a152-1c3e955f9731/dutufesovax.pdf
    • https://cdn.shopify.com/s/files/1/0438/2425/1042/files/nokia_android_new_phone_2020.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_off00003b0c.bin
33402734000efe397bf90a30fe83f87f0563c063fea96155192b0aab1be04632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B0C 5468 bytes
font_01_sfnt_off00004d9f.bin
068ee7b02cc9fe58485eb963579a995f42f58a778f50883bd64c6e65e6c908c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9F 7516 bytes

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