Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d75a6457e9e37c…

MALICIOUS

PDF

34.5 KB Created: 2020-08-18 17:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ffe7978259418c0af171f6bcde628a73 SHA-1: e8632f12d4656ff8981dbf8f634309b6e044b3a0 SHA-256: a6d75a6457e9e37cb11e71d6b99f8cac6fee8edf76ad6c97e21702a4ed610fc0
162 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used for link farms or phishing campaigns. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body contains text that appears to be a lure, possibly related to song titles, alongside metadata indicating it was generated by wkhtmltopdf.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=anjathey+songs++masstamilan In PDF document text
    • http://xujuva.artisandogharness.com/uploads/1/3/0/7/130739564/niwanaraditapes.pdfIn PDF document text
    • http://files.cosmiccacaompls.com/uploads/1/3/0/7/130738722/buremika.pdfIn PDF document text
    • http://rijof.mrslorenzscience.com/uploads/1/3/1/1/131164250/1341566.pdfIn PDF document text
    • http://dofon.ames-center.com/uploads/1/3/0/8/130874284/2553704.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/1/0431/7767/2868/files/migibewobifisifamolagifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/best_books_of_all_time.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9721/7440/files/tratamiento_de_la_sinusitis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/64886116048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/33880958035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7708/0990/files/95104742736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/82819852281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/32750887673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/ranejomikev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/tetem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/71462015337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/mefupedakur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/rafidazidutonar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/zogakirikilogumenabada.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_off00004ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE1 5172 bytes
SHA-256: 755c8a9f14f81e82032e763acd64b49ab26afe0206ad7143112af29de39005da
font_01_sfnt_off00005c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C66 9640 bytes
SHA-256: 8f891eb96923dfd922ae31eccccd13a84de2fcca04181d3f1b4096ab51a9b58b

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