Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c843c49d5c66b54…

MALICIOUS

PDF

67.6 KB Created: 2020-08-05 04:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9b113751d5d99ec40cfcd6ddceed521f SHA-1: fd67e6a8e504141d1c09979890627af7cf40d9c8 SHA-256: 4c843c49d5c66b543997a60c80ef23ac09c291b6e60dd2fcc2f2844052027f59
194 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. This URL is presented to the user within the document body, disguised as an 'employee contract letter pdf'. The file also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering, tricking the user into visiting a malicious URL.

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=employee+contract+letter+pdf In PDF document text
    • http://wikisuve.annimorris.co.nz/uploads/1/3/1/4/131407921/694b2fa2e.pdfIn PDF document text
    • http://files.sswonline.com/uploads/1/3/1/8/131871467/benab.pdfIn PDF document text
    • http://files.yourernow.com/uploads/1/3/2/7/132740291/lirejefotiwop.pdfIn PDF document text
    • http://files.chromosome3andme.com/uploads/1/3/1/4/131454355/watabijexupo-jagaxepefuj-pezubewajo.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/1/0431/2698/0765/files/72406639921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/saxuzar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/7503360304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/40504766991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/56488974331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1652/7770/files/vukerij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/samsung_bd-_j5700_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/gawetopavakuketenisaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4442/0246/files/605625987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 5180 bytes
SHA-256: 9a16afc6263fc4f1c24069d19f4c74b75d2812a7c0690865a3526d1caf21f552
font_02_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10332 bytes
SHA-256: 78b4af45111b644c45a1d560b2667ed36616001c8162c8cf848f479b9144b695

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