Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67d96763da36e55…

MALICIOUS

PDF

129.8 KB Created: 2021-01-04 00:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d5f11baf50be755c895434978d18988 SHA-1: 7910110082b89c97868e261d5fa2355334eb82e2 SHA-256: f67d96763da36e55dba460b2bed33aff1a1eecb6685378a16cb0cf99cfe822e9
222 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a game walkthrough, combined with metadata from wkhtmltopdf, suggesting it was generated for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/123?utm_term=star+wars+bounty+hunter+game+walkthrough In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_5fe7e0c2294d2.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/digekafalowodabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fc2ab1f4b517.pdfIn PDF document text
    • https://jikesisepam.weebly.com/uploads/1/3/1/4/131406861/kimon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_5fb5c0272a42d.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/9960705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5faedc6bad471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd15436db9de.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/gcUhgjd/ragudajozavolu.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/pisedij/sibidogujiwuzujeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c290f2-af87-41cd-abdc-f108cb185a0c/accu_chek_active_manual_de_uso.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_off0001bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEDC 5600 bytes
SHA-256: 9834ee39c5dddcd6f71fc61e72836a384a6d5959d599aab4d8a616ef72406884
font_01_sfnt_off0001d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1CF 11808 bytes
SHA-256: 50059b16e2e7791443c364210055e30093851d1ec17f1de262a13cad17ae30c3

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