Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff40c655f6880cb…

MALICIOUS

PDF

50.3 KB Created: 2020-07-29 22:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a87f253f25d23324f6b1f78521a66d08 SHA-1: 43823be3f2d35b2b60aadc89daad9b05b7dc4ed2 SHA-256: 1ff40c655f6880cb822cb1d536d9cdd625ade8a9f9fadbd155f161d0167cd9cf
194 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 of which point to domains associated with link farms and redirectors. One such link, https://ttraff.ru/pify?keyword=knowledge+acquisition+definition+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains no readable content to provide further context.

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=knowledge+acquisition+definition+pdf In PDF document text
    • http://files.vreist-slimportfolio.com/uploads/1/3/1/3/131383934/fivegikatuwekivukiz.pdfIn PDF document text
    • http://files.theaddhippie.com/uploads/1/3/1/8/131871614/9972893.pdfIn PDF document text
    • http://files.schoolpatio.com/uploads/1/3/2/7/132740415/6232202.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/1/0438/3647/3501/files/97969133911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8275/9836/files/59070113662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/68706705413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/kajipujimepowewoged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/titowoxigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/30160212856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/tepefufuvigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7879/3878/files/zusugulevaxakuruvaduxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/68200681975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/vakozete.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 8

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_off0000871a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x871A 5296 bytes
SHA-256: 8071926d6fb0ee5185aa185515f0c2685e53c821b00a26506fededa1ad6c9313
font_01_sfnt_off00009946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9946 10072 bytes
SHA-256: ee7903d459870c589c72f57fd173dfa4428a13de4f26b10692a82fa64344fb82

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