Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d81be39566a7bc9…

MALICIOUS

PDF

47.0 KB Created: 2020-07-29 13:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57084287a71e851035788fa8e790ae7 SHA-1: a40f569a3b710bed9eed6b499d4a7ec68a9190fa SHA-256: 6d81be39566a7bc97c126c351ead3b4664ff587ba600e42b4c21ac66e64e4498
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, appears to be a lure related to electrical engineering lecture notes. The presence of embedded URLs and the link farm structure strongly indicate an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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/pify?keyword=basic+electrical+engineering+lecture+notes+pdf
    • http://files.easternsloperanch.com/uploads/1/3/2/6/132681404/3588728.pdf
    • http://files.morristownsurgery.com/uploads/1/3/1/4/131483067/5554215.pdf
    • http://files.youngoakmorgan.com/uploads/1/3/1/8/131871859/sixabamuf_lirok_dufajuxuwi_zaboriwowib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/ruvolunufudedapami.pdf
    • https://cdn.shopify.com/s/files/1/0439/3933/2251/files/kajizeseruwefoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/gibid.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/ririnobigevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/62480426588.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/jidutinuzajonupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/42594678164.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2156/files/guzelufonosuberasuxez.pdf
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/kaxotixubegin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxolalinurijelibabozafod.pdf
    • https://cdn.shopify.com/s/files/1/0438/4397/7366/files/22541628119.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/89098273810.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/toniseko.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_off0000793f.bin
214d6c6aef6c28cf5df2c24a332577bbea781cddd7246d8c30f1f0964ff87d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793F 5256 bytes
font_01_sfnt_off00008b1c.bin
18984214f4752eb1df2b607b6db2783fe848f1915ef4fd9f0f2526da0aa64875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1C 10284 bytes

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