Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99dcf4ea1a522cc…

MALICIOUS

PDF

70.7 KB Created: 2020-11-20 16:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fc4fbdb832443c83c46bcabd2d345460 SHA-1: 2a65c1d14c183166939f1e0b2893b281f132036b SHA-256: d99dcf4ea1a522cc575fd692cb77c5c95de5e5d122c4e1cd53ff7653a7f19f30
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, pointing to known malicious infrastructure. The embedded URLs, particularly 'traffmen.ru', are flagged as malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to a 'Greenworks pressure washer manual', aligning with phishing or social engineering tactics. No scripts were extracted, but the PDF structure itself facilitates redirection.

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://traffmen.ru/123?utm_term=greenworks+pressure+washer+manual In PDF document text
    • https://dojenamolusojow.weebly.com/uploads/1/3/4/8/134868247/206828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_5fa44102e6848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5fac05b9ce65f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f89ce6c09639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5fa72512487d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_5f9d919cbd52b.pdfIn PDF document text
    • https://lereviripos.weebly.com/uploads/1/3/4/6/134663640/237897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8ed04850434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f9db5cdddad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fa24f8a6a89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f94605ef1bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5f9697fabf2bd.pdfIn PDF document text
    • https://konatewed.weebly.com/uploads/1/3/4/6/134692195/xawulidipitosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5f9073fab43f9.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.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/1107436a-0b26-47d7-a6d4-7ff07d4e5c6a/kowurepaduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d2b12c-6bde-433a-8524-2c7e64104256/51486538457.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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 5244 bytes
SHA-256: 4098e1859276f19861690613bc8ccfa700899df75a78761f09d6e48e25faa3e9
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10584 bytes
SHA-256: 7013a2050430e5cae948af937a9e79ccbdc90a745520ebef780899cd3ff0ef13

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