Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc65345ad498bc1…

MALICIOUS

PDF

66.1 KB Created: 2020-08-04 18:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9553a29741d29227b07f608021790124 SHA-1: 309ae3c367dae3f8cba06585e3d7e3fb6f00f314 SHA-256: 6bc65345ad498bc1eb299ec05b3eb63e2d018d8896ba995e42cd3550d3630f8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Busonid 50 mcg pdf' and a URL pointing to a malicious redirector, suggesting a phishing or scam attempt. The presence of a large number of external PDF links further supports the classification as a link farm, likely used for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ttraff.ru/pify?keyword=busonid+50+mcg+pdf
    • http://files.snowangelsiberians.com/uploads/1/3/1/4/131438419/wovukejoligapamoz.pdf
    • http://files.narnargoonfc.com/uploads/1/3/1/4/131455158/5777833.pdf
    • http://files.christopherdavidroche.com/uploads/1/3/2/7/132740498/5642674.pdf
    • http://files.thedrystones.co.uk/uploads/1/3/0/9/130969811/0cc894.pdf
    • http://files.moveovermsa.org/uploads/1/3/1/6/131606631/8576641.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1461/8262/files/zikopofitoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/banilimuxofunilovogopi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5075/2417/files/54740993585.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66923604261.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/convert_string_to_lowercase_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/korasikosujaxapenuvomix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/nurogixenav.pdf
    • https://cdn.shopify.com/s/files/1/0434/9489/9864/files/gefol.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/90616490446.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/woremivexobunoda.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/aggregate_planning_techniques_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/52108846513.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c415.bin
4b750892a25c517145239a771830152b8a1a456f243046127164ec7d64d050d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 5452 bytes
font_01_sfnt_off0000d6a2.bin
9a84c67e062ceffb0fb1ef4b167ab775540616bb0533722b19452bff60aa2034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 10932 bytes

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