Malicious PDF — malware analysis report

Static analysis result for SHA-256 5916e7c2a5786f40…

MALICIOUS

PDF

42.9 KB Created: 2020-08-05 02:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 77b8b69b866dcd2f3ab4791f63cdb00f SHA-1: b8375ecf9ae88f1cc75be3639175291d11b82587 SHA-256: 5916e7c2a5786f40f70e36c6e391e409409cef44543bd9fbb191d0dfd315ca60
194 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 SEO link farms or to redirect users to malicious sites. One critical heuristic firing specifically noted a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=pdf+file+structure'. The document body contains garbled text but also includes several URLs, some of which are confirmed benign, but the presence of the malicious redirector link is a strong indicator of malicious intent.

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=pdf+file+structure In PDF document text
    • http://files.stonecreekcabins.com/uploads/1/3/1/3/131384575/lepajo-gejexoxexo-kiwojiwiboga-zajusoguka.pdfIn PDF document text
    • http://files.backbeatphotos.com/uploads/1/3/0/8/130874583/sanavipogejegu.pdfIn PDF document text
    • http://files.coladoart.com/uploads/1/3/0/7/130739489/pamebixuvo.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/1/0437/4704/9621/files/mastercam_x9_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/14648798768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/jovejavosiwamog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/derukoboda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9856/9888/files/popular_arab_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/madiwemaresolasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/nerizapen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/88943594967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/harley_davidson_golf_cart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/5970164963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4567/4389/files/342449631.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_off00006bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 4808 bytes
SHA-256: a65892d72f13c43700cbfb729bf9da3fb5dd17c3be1a4bd8e1f10403cbf38336
font_01_sfnt_off00007c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C21 10300 bytes
SHA-256: 762a39b5b8d03439b6f5683516a1c18d370e81b181ac4bc78529b6263098db20

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