Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b0b774e2921be5…

MALICIOUS

PDF

49.5 KB Created: 2020-10-31 07:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2fba0280e316abc96456d2a644b0995a SHA-1: c8f131e0674ec5a40c03a1009c6ba72c9232c76d SHA-256: 25b0b774e2921be52cdfc87683dd60ab8a27b1bf935cf87d1b48b963c2a9f8f7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/123?keyword=brondi+amico+mio+3g+manuale'. Additionally, it exhibits a 'SE_CLIPBOARD_COMMAND_LURE' heuristic, indicating the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/123?keyword=brondi+amico+mio+3g+manuale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f8d3614a5f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5f970eac6013c.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/3623283.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/jakujakula/artificial_neural_network_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f241a2eb-e0e6-4927-a1b2-bffbf140deda/fekatuwan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/9531/1782/files/5483102943.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/vaders_apk_fire_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/48903760027.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/john_deere_44_snowblower_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/90100123482.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/jgs_floating_reamer_holder_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/riridajulezirexopesaxoval.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_off00008016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 5296 bytes
SHA-256: e150209ce5471b1a2aa95be7773a420b4d3cbee888b28a4c1fab4249b469aba1
font_01_sfnt_off00009201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9201 11632 bytes
SHA-256: 4b2b57a9139d04341ff94eca03933a849db5705fd7854c2c15f53d9c1b9bf6dc

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