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)
MD5: f49874eee776aecf4091f08fab9e849c SHA-1: 3672ec3132d22ba36a3511613f217e1d8fda6986 SHA-256: 138625403d44b3341ebc286aa487224967f5442cf18fb73887ab1bde2645315e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'nonfiction reading test garbage pdf answers', indicating a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.axsbeta.org/uploads/1/3/0/7/130775551/nopugerurateri_fedugumeninaxi.pdf
    • http://files.craftsmancctv.com/uploads/1/3/1/1/131164095/letisizijo.pdf
    • http://files.mocherie.com/uploads/1/3/0/7/130738719/3112379.pdf
    • http://files.pieroth-winetastings.com/uploads/1/3/1/0/131070841/kimupi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/78384865114.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/45797926316.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/94697711376.pdf
    • https://cdn.shopify.com/s/files/1/0432/8908/4068/files/75692957013.pdf
    • https://cdn.shopify.com/s/files/1/0435/7678/7107/files/45803350874.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/waviwuxekugigolotiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/zawawefujimiborurunow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/doxevixege.pdf
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/59215319136.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/gukamup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/sujotaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/2440532356.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jatebilebasa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078d2.bin
41d6601065a35501825264553b5fa75ad5acfa1609eba6b7a144392f2f160851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 5280 bytes
font_01_sfnt_off00008adb.bin
db88c1d55c983894247cf019328b9fe4740d7f5e7d8b3e0d2e7315d4ff000dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADB 10396 bytes

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