Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d119e3bf66a73d…

MALICIOUS

PDF

67.4 KB Created: 2020-12-17 05:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 99b77b9e94717253b3fad60569e75a31 SHA-1: 403b270157e65ec8e2fc52347283c6b489d9241f SHA-256: 17d119e3bf66a73d452411441dfcca7ad9eb751bec5e96886bbed9d441b2eaed
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffine.ru'. Additional heuristics indicate the PDF is a link farm on disposable hosting, and a machine learning classifier flagged it with high confidence. The presence of embedded URLs and the 'Download Button' heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=apk+madden+overdrive In PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/1621902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fbe05878515b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8d247f9cbb8.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/a49917f.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/visosimovijokom_kijiniwitajos_xikimezinizafop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_5fbcfef543da0.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/68a1f4f587.pdfIn PDF document text
    • https://bopetibalat.weebly.com/uploads/1/3/4/8/134891962/08a5618553a.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/mijumomub/mumowo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3486312facd59cebc5192/t/5fd61e7096ed101a3e37fdf3/1607868016934/postman_interceptor_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/91201025394.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a69f81da8a590db1d885/t/5fcea86a93aac70b80781f45/1607379051628/digigude.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd1e0c89e1c4b8fb81223/t/5fc8aea790a4f8549d7eb101/1606987434854/77566158137.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_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 5008 bytes
SHA-256: e19660dc3818bfd19f18e47b56386e856c718f5e9d6fe08526a03ff99eb245ea
font_01_sfnt_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 10724 bytes
SHA-256: 09a0c2752e1afef7c7d9f4bfd477dd17f45176683392ec06153d08d29a999941

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