Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d787be0098c0167…

MALICIOUS

PDF

47.9 KB Created: 2020-08-19 10:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d9ecac8270af329aadd97a74d31c13 SHA-1: fd631e9295f665b67d8fb7f4451dd1f978c54d5c SHA-256: 4d787be0098c0167927c95f2c1ffdd1aa9a74b9a20e7b465191d317dc9d14670
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

This PDF file exhibits characteristics of a link farm, containing numerous embedded URLs pointing to other PDF documents. One of these URLs, https://ttraff.cc/pify?keyword=bulaklak+ng+city+jail+pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link-based redirection.

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.cc/pify?keyword=bulaklak+ng+city+jail+pdf
    • http://files.taracarpenterart.com/uploads/1/3/0/7/130739780/xogipunak-wobovoladodowo.pdf
    • http://files.lilacandlaceco.com/uploads/1/3/1/1/131164153/rugurobewafu_maluxovugavine_xasizosiruli_bozutixajojo.pdf
    • http://files.chaiscope.org/uploads/1/3/0/7/130740522/rusapaxamiso-nonipulum-foragate.pdf
    • http://files.pastorodc.com/uploads/1/3/1/3/131398252/9678539.pdf
    • http://files.angelwolfcomics.com/uploads/1/3/1/8/131856079/kilizetedusod-zubojefakezu-savepekekexes.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/gozumoradoboke.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/2279448833.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/99655465716.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/6390772965.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/lusagedemutad.pdf
    • https://cdn.shopify.com/s/files/1/0433/8938/6901/files/kuxogixudafel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/bimoweledisepuwevakasafa.pdf
    • https://cdn.shopify.com/s/files/1/0448/5827/8050/files/projeto_de_piscicultura.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/97221050886.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/zezowig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/iceland_ring_road_map.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d07.bin
a7f925664e1409686cd8771b150b808c1ddfc36546d492f681c54285fbefe6f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D07 5340 bytes
font_01_sfnt_off00008f59.bin
bddd7997661d8d7e978f68186d25fed43ae7086926edd2f967780a7dd2218440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F59 10316 bytes

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