Malicious PDF — malware analysis report

Static analysis result for SHA-256 163240257d87371e…

MALICIOUS

PDF

51.2 KB Created: 2020-08-22 01:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 06da15e6cd51f8160df38582833faad0 SHA-1: f5cf5698462a36cc49343f27239df2afd4e69700 SHA-256: 163240257d87371e477d85e3adebf3a4a64db0ba5b624fe71174240a23335240
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a mass external link farm, with multiple links pointing to redirector infrastructure. The primary redirector URL, https://ttraff.ru/pify?keyword=aop+full+form+in+budget, is flagged as malicious and likely serves as a lure for free downloads, leading to phishing or malware. The ML classifier strongly indicates maliciousness.

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=aop+full+form+in+budget In PDF document text
    • http://gipew.youthultimateprogram.org/uploads/1/3/0/7/130775583/wowarefevadufet.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/1/0428/3075/8054/files/chemistry_burdge_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/mechanical_split_keyboard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6119/9526/files/gafowaputitoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/gafateradumilawixilugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/72821494698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/79991482131.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8094/1721/files/81427742281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kujefitil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/bsc_nursing_1st_year_books_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/wabikovawanuromojax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/pogivofuxefolupomoxa.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 7

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_off00007854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7854 5104 bytes
SHA-256: 0e4f27d6bcda7f3a37c910a8779a9892002b0898f482d4f74e7193bcd7115996
font_01_sfnt_off0000898d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x898D 17360 bytes
SHA-256: a77f3c12d49c212a7554f13f093d4c0430a46bf7dfc89a858c1619736d17fac8

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