Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87f866df01492f8…

MALICIOUS

PDF

76.4 KB Created: 2020-11-21 05:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 85d3a8391fce79bf33bdd01a8f62ff26 SHA-1: 169dd86c3633b1d0d2de7ffe5b620913fb0ddaad SHA-256: a87f866df01492f892f8275bc6db142c9a9ee28b82ecd782a038a1fb74f9d9ee
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://cctraff.ru/123?utm_term=15+foot+trampoline+pad'. The document body, though heavily obfuscated, appears to be related to trampoline pads, suggesting a lure for users seeking such products. The presence of multiple external PDF links further indicates a link farm or redirection strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=15+foot+trampoline+pad In PDF document text
    • https://mafupixalikufu.weebly.com/uploads/1/3/4/6/134662523/3664a2a258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5f9de123b693f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5f92b0a9c5e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_5f9a3653849b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f8e9706953b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f8a039ea37c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f8bf2cdd40cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f8b7ac4cb0fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5fa107cbcdba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5fa3052781d33.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/f0977b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_5faa81d3ce256.pdfIn PDF document text
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/2494635.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/683b16cf-7319-4b09-a19e-5b979e0e79db/5430089416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e25597-a235-4b98-ab18-76644b55f0c6/terrarium_particle_sprinters.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/xudivedarele.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5092 bytes
SHA-256: f617e26bd9ca895c30868243487780e3126dcfb4a4695baa912ec0e561db0727
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 13856 bytes
SHA-256: 1b68dfbcb76d785b662bc71937e6f2f68b505729ace5c44bc2260a7cf845a657

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