Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b13ab5c42693839…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 16:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e70538374f544d20a81e808fcacac4 SHA-1: 38f0b23c9a85b2cd291d939313ec2c9992972d6d SHA-256: 4b13ab5c426938392048ba987894e7b67449ed2878183b01d9c6a930504fe9be
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure containing a large number of external links, a technique often used for SEO poisoning or to host phishing lures. One critical heuristic flagged a link to a known malicious redirector, ttraff.cc, which is designed to obscure the final malicious destination. The document body contains text related to a 'Caymus special selection 2014 tech sheet' and includes the malicious URL, suggesting a lure to trick users into clicking the link. No scripts were extracted from this sample.

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=caymus+special+selection+2014+tech+sheet
    • http://files.danieldetogni.com/uploads/1/3/1/4/131437883/5685943.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3712/files/29353800003.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/96591684997.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/canciones_para_tocar_en_guitarra_acustica_faciles.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2381/files/77317868476.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/anemia_aplasica_de_fanconi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/angebot_absagen_freundlich_formulieren.pdf
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/constructing_equilateral_triangles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9891/files/zoology_book_for_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/6242603004.pdf
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/69657357149.pdf
    • https://cdn.shopify.com/s/files/1/0432/8715/0752/files/renokerubojetemiwi.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_off00005a28.bin
4d650d5a2ce1df60ce5eb601c397777fbf326082bf2d486c41e4342c7b874bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A28 5496 bytes
font_01_sfnt_off00006cc3.bin
59d6929c9eb0d17b70f212d51589a60fbe742189ddb40809ec7f8bc0667db770
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC3 10724 bytes