Malicious PDF — malware analysis report

Static analysis result for SHA-256 431cb05b3beb4cda…

MALICIOUS

PDF

46.4 KB Created: 2020-08-20 12:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f328605740e4b5860d33243e9a6bbdd4 SHA-1: cc7f9757a6ce0fb7534e32c0c47596cd45f664ab SHA-256: 431cb05b3beb4cda7394525e885a96c22cdbec9b36ac020324af2e49dc41268f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for free sheet music. This indicates a phishing or social engineering attempt to lure the user to a malicious site. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=nothing+a+chorus+line+sheet+music+free In PDF document text
    • http://xonur.lh4biz.com/uploads/1/3/0/7/130739777/bafavave.pdfIn PDF document text
    • http://files.sergiocote.com/uploads/1/3/1/4/131455621/gotop-dagipak-revojezuwuxiwu-mosodenon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0800/7072/files/85301912344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/91228890755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/ielts_writing_sample_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/48423972267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/graphics_design_tutorial_bangla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2126/0184/files/android_app_development_tutorial_bangla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2508/4065/files/osrs_crystal_bow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/alta_performance_em_vendas_senac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/kiwofamojiba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/47095055584.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/2699/2551/files/27599071055.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6990 5148 bytes
SHA-256: b0165e53633ec0a130c3a635b5707ac67021d5feb62f56191b85577b1cfb33eb
font_01_sfnt_off00007ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE5 10376 bytes
SHA-256: 70ce7c96b92f8078ebcce3869a5d6a0ed77d77a4a2e88a8ab1b05d54b186f3ff
font_02_sfnt_off00009e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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