Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c18798e9a95892…

MALICIOUS

PDF

38.2 KB Created: 2020-08-07 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a161669dc4d053f29ab355cdcf3a57f8 SHA-1: aeac83019056bb97ebea782ab4a93c7fb2b11ebe SHA-256: a9c18798e9a958929dcd5874e9b66f1644be59eb87f3a4c9abe45419ac48478e
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a lure to external content. The embedded URL and document body text both point to a 'class diagram book pdf' lure. The primary malicious URL is ttraff.cc, which is known for redirecting to malicious sites. The document itself is generated by wkhtmltopdf, suggesting it was programmatically created for this purpose.

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.cc/wb?keyword=class%20diagram%20book%20pdf In PDF document text
    • http://files.bayareaboatandhomeloans.com/uploads/1/3/1/3/131398059/3302143.pdfIn PDF document text
    • http://files.jazzymaths.com/uploads/1/3/1/3/131382497/a23d68.pdfIn PDF document text
    • http://files.holly-blue.com/uploads/1/3/0/8/130873903/jufav-memekeve.pdfIn PDF document text
    • http://files.aboundinlove.com/uploads/1/3/1/0/131069869/nipumifabolej_wibuvupekefile.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/1/0430/3178/9721/files/zituwupik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/8571390963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59554496318.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/59512291410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/dulas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/mathematics_for_economics_third_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/pajevimumetusawudoputewul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/sefogesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/69594169545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/57007863034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/mesorudadezemupisimizusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/moxufavoxemebinopegojivum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/52532849053.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_off0000599b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x599B 5472 bytes
SHA-256: 0ded2fc05efc89594508e1bcfe851de1f3e01a85dcdd8f4336ac105cf30b9862
font_01_sfnt_off00006c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C18 9432 bytes
SHA-256: 87bde20383209c2506f43ebc85c46830c556f65ebc5eb3a3ea5d701145638e47

Open this report in the interactive analyzer, or submit your own file for analysis.