Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9851e3eb102bc6…

MALICIOUS

PDF

125.4 KB Created: 2020-08-03 09:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dcd2af0cc7ce13d873a26fe3fe8ea626 SHA-1: a225c80737294350e1c61d1780859e4a62f9500f SHA-256: 4f9851e3eb102bc68ecb909a7b40f1d3f75909a897c50adb1e5acc6cd3e0187b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for an academic PDF. The document body, though heavily obfuscated, contains the same URL and keywords, suggesting a phishing or scam attempt. The ML classifier also strongly indicated 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.com/pify?keyword=differential+equations+4th+edition+blanchard+pdf In PDF document text
    • http://files.wisconsinmomtribe.com/uploads/1/3/1/4/131437834/8344e400f7.pdfIn PDF document text
    • http://files.ebizownersolutions.com/uploads/1/3/1/1/131163867/birozovedaket.pdfIn PDF document text
    • http://files.mountainstudiohamilton.ca/uploads/1/3/1/6/131606314/5376360.pdfIn PDF document text
    • http://files.prathleticboosterclub.com/uploads/1/3/1/4/131454620/f56346395c9.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/1/0432/4209/4756/files/71703895727.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/bisudomatusefilotaxad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/78768724043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/14074224192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/81380211348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kirojaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/70212485610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/63371352542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/vuzufewufideg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/fubokedim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1046/5698/files/74493090440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zututekafufefosapebuk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18592 5596 bytes
SHA-256: 904c6ff7daa8cc8dbc72468183fdaaad6bac60730562377258ea7c30f2dbe753
font_01_sfnt_off0001988e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1988E 18320 bytes
SHA-256: fdbdf6be907e596b4bd448a6e32aaa300691f08d35a3117986f1b9385dc39b2c
font_02_sfnt_off0001d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D188 16360 bytes
SHA-256: 051ae9903f291b9b31f06efc6c0b9ea495e41f8cb738963fde37fc7015f2d9d1

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