Malicious PDF — malware analysis report

Static analysis result for SHA-256 138625403d44b334…

MALICIOUS

PDF

46.9 KB Created: 2020-07-29 22:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f49874eee776aecf4091f08fab9e849c SHA-1: 3672ec3132d22ba36a3511613f217e1d8fda6986 SHA-256: 138625403d44b3341ebc286aa487224967f5442cf18fb73887ab1bde2645315e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, suggests a lure related to "nonfiction reading test garbage pdf answers", likely a phishing pretext. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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/wb?keyword=nonfiction%20reading%20test%20garbage%20pdf%20answers In PDF document text
    • http://files.axsbeta.org/uploads/1/3/0/7/130775551/nopugerurateri_fedugumeninaxi.pdfIn PDF document text
    • http://files.craftsmancctv.com/uploads/1/3/1/1/131164095/letisizijo.pdfIn PDF document text
    • http://files.mocherie.com/uploads/1/3/0/7/130738719/3112379.pdfIn PDF document text
    • http://files.pieroth-winetastings.com/uploads/1/3/1/0/131070841/kimupi.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/1/0428/9173/9295/files/78384865114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/45797926316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/94697711376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8908/4068/files/75692957013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7678/7107/files/45803350874.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/waviwuxekugigolotiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/zawawefujimiborurunow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/doxevixege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/59215319136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/gukamup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/sujotaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/2440532356.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jatebilebasa.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 4

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_off000078d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 5280 bytes
SHA-256: 41d6601065a35501825264553b5fa75ad5acfa1609eba6b7a144392f2f160851
font_01_sfnt_off00008adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADB 10396 bytes
SHA-256: db88c1d55c983894247cf019328b9fe4740d7f5e7d8b3e0d2e7315d4ff000dc9

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