Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a567eecb502ba8…

MALICIOUS

PDF

43.8 KB Created: 2020-08-18 20:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edb7293406a467909a903ef621fa2dae SHA-1: f1a5cf32cbb5c47848cf2996d224a3d1d4703a5f SHA-256: 51a567eecb502ba8611fcf43c5242c6a6f82a4467d2ef5278df5787f54581b93
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This indicates a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery.

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=bookkeeper+duties+and+responsibilities+pdf
    • http://goforip.paulwrayleeds.com/uploads/1/3/0/7/130776394/larubewaxufivejuruse.pdf
    • http://files.yournaturalhairspot.com/uploads/1/3/2/3/132303023/55b33a7ec4c788f.pdf
    • http://files.onislandagentmaui.com/uploads/1/3/2/8/132814220/6442688.pdf
    • http://debipuw.theboywhoknewthemountains.com/uploads/1/3/2/8/132816066/3899609.pdf
    • http://zuxokulo.rescueridershorserescue.com/uploads/1/3/2/6/132683014/3bee0cd58b92c.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/jibabejolerazanigamiwoseg.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/estrategias_de_comprension_lectora_ziemax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/wolitexufisili.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/37553354152.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/xurimetikawetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4003/9324/files/remove_untracked_files_git.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/7515136556.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/www_craigslist_org_knoxville.pdf
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/gegonetaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/physical_science_textbook_grade_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/16625287968.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/bjt_biasing.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_off00006c69.bin
ce9ed7849685f1a7464c96dc7a2dc3eb2671711e55eba76e4a3762aac2fc6796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C69 5288 bytes
font_01_sfnt_off00007e71.bin
51294b61d8221e46bc20e786dacca3675e8e7e5ab2f38795221d8b3264f5854c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 10428 bytes

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