Malicious PDF — malware analysis report

Static analysis result for SHA-256 645d92a33503cd52…

MALICIOUS

PDF

44.9 KB Created: 2020-08-19 07:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cb8c9c6457b0fa92f7799ddfac1f8988 SHA-1: c6e32ac54ca1879d37f7a3115ff05f27156abb8a SHA-256: 645d92a33503cd52cc1f37eccf4203c3d4ce7cb1aae2f987b1c93c4a3c2523f3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO-based phishing. The embedded URL 'https://ttraff.cc/pify?keyword=caste+validity+form+16' is identified as a malicious redirector, likely used to funnel victims to a phishing site. The document body, though partially corrupted, contains text related to a 'Caste validity form 16', which is likely a lure.

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.cc/pify?keyword=caste+validity+form+16 In PDF document text
    • http://files.quintabella.com/uploads/1/3/0/7/130775490/jimutafesuxirife.pdfIn PDF document text
    • http://nazeb.parablecandlecompany.com/uploads/1/3/0/7/130738854/5930211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6213/1878/files/97547215571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6237/8139/files/ribajalamedasotenafovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2648/0290/files/86664374662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/vulanisipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/fijikovizewit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/sumogerikulevajuxaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/cape_slot_osrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/28403215908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/irs_form_8917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8439/9270/files/76471828405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6655/5558/files/2474613159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/caffe_install_ubuntu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/4217/1038/files/84250205622.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 3

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 5328 bytes
SHA-256: 330aa9e9f70accc928463e28e1452ee805bab502588f42d2cc4c9b1e78ed988e
font_01_sfnt_off00008454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8454 10084 bytes
SHA-256: 628e6e21bbe17d25417be30cb7d62f2cd280762bedeca5f38caf4b8b84b91541

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