Malicious PDF — malware analysis report

Static analysis result for SHA-256 487351c6c988b01a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-25 09:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf39f122504f9ba916f63f72cdd646e SHA-1: 120bb67448da673d2e11f0925bc6299f63276ad0 SHA-256: 487351c6c988b01aac17c6b793fb0e02d13a673875f84fd23212817ec0804347
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=manualidades+para+navidad+en+fieltro, which is flagged as a malicious redirector. The presence of numerous other links hosted on cdn.shopify.com suggests a link farm designed 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=manualidades+para+navidad+en+fieltro
    • http://files.elaborateevents.ca/uploads/1/3/0/8/130814055/pulasosozexuduxus.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/sovavulumilu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/surexobakamazowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/tulofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7007/files/99144494088.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/44781803756.pdf
    • https://cdn.shopify.com/s/files/1/0437/4872/0789/files/powonujufizimike.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/26648382776.pdf
    • https://cdn.shopify.com/s/files/1/0462/6415/6314/files/sixodijuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/vibovejolariwasapogusop.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7938/files/6495100628.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/rakuroforu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8428/files/nsou_assignment_cover_page.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/novel_best_seller_2020.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_off00005e76.bin
b78ddffa8e700779717f0bc8af1cee29f7b773f7927442591f8fb240098b42df
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E76 5100 bytes
font_01_sfnt_off00006fea.bin
102b6bb6c98cb38c7e9a3726f9c3d51dbc802fb3e9691a3c3ae68a42ef2612a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEA 13644 bytes