Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cb3c263e453463…

MALICIOUS

PDF

39.4 KB Created: 2020-08-09 04:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 671f39d6f2854542cac7f1579063bc6b SHA-1: 0a93f886cf586779e390c09ace18aa8b7ca15220 SHA-256: a5cb3c263e453463d824e3c5a0396741d61b8322db9cbea596634f0305f1383d
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector at 'https://ttraff.ru/pify?keyword=amituofo+sutra+pdf'. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious content. No scripts were extracted from this sample.

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=amituofo+sutra+pdf In PDF document text
    • http://files.wallacecarpentryinc.com/uploads/1/3/1/8/131871740/ditezitepuworix.pdfIn PDF document text
    • http://files.hfclassof69.com/uploads/1/3/1/4/131438557/a1df8ee33d070.pdfIn PDF document text
    • http://files.indianaclassics.org/uploads/1/3/1/8/131871816/tidela.pdfIn PDF document text
    • http://files.brotherwade.com/uploads/1/3/2/3/132302892/1732990.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/1/0431/9553/1424/files/buputokipuxigaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/9827726906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/bewudukitisoludubises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/gexamalobumakasatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/gesofesorodirotig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8994/2945/files/rental_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9354/7426/files/jepokofon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/senajigobaseguzares.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/gikekofumade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/samples_of_formal_letter.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 4

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_off00005e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6E 5144 bytes
SHA-256: 6b73b160c3c8b0a53e9104cd6f1a7a3c956e005922692f304e0244ea9a8cf27b
font_01_sfnt_off00006fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD6 9696 bytes
SHA-256: f20a04d33dde02da7af129b6566a9613687f3c062788d7cbc5e128848e395789

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