Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f258c93c6c438e4…

MALICIOUS

PDF

123.3 KB Created: 2020-08-03 04:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1a205c2c0b69fc2c50db2aa064a541 SHA-1: daf3a0e6e61e1f87a210ba71fdb86e7147ccb08e SHA-256: 5f258c93c6c438e43f99bf7d365d0a47fa63f95ce4cc16205b98adc4813ebafc
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a free download for 'Puzzles to puzzle you shakuntala devi pdf free download'. One of these links, https://ttraff.ru/wb?keyword=puzzles%20to%20puzzle%20you%20shakuntala%20devi%20pdf%20free%20download, is flagged as a malicious redirector. This indicates a likely SEO poisoning or link farm attack, aiming to drive traffic to malicious infrastructure.

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.ru/wb?keyword=puzzles%20to%20puzzle%20you%20shakuntala%20devi%20pdf%20free%20download
    • http://files.littlewordybird.com/uploads/1/3/1/8/131872149/jubogivetujoze.pdf
    • http://files.aubrieadams.com/uploads/1/3/1/3/131379815/08ee0f82b40ac9.pdf
    • http://files.smealstudentmentors.org/uploads/1/3/1/1/131164431/jevefosunijutifiw.pdf
    • http://rigetol.jreschkeart.com/uploads/1/3/0/9/130969426/rewamigutukova_linufuvoja_surujezi.pdf
    • http://files.czech-club.co.uk/uploads/1/3/0/8/130873732/guvanogit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3920/3221/files/48131535421.pdf
    • https://cdn.shopify.com/s/files/1/0439/3166/4552/files/keranis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/woremojesanupej.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/lopedanufananomiparu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/51102583268.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/32165858888.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/foxavoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9308/files/wigafuline.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/96266687238.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/xuwukatubibegetusebaxajas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6717/8134/files/bunn_commercial_coffee_maker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nawujumukupuzuwoxelojoses.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_off0001a4a3.bin
f760699660f6b6f4389b079d732fc098b0025dc595acce761d17310ee2b716c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4A3 5496 bytes
font_01_sfnt_off0001b778.bin
983143ac53ae177480b6ac313666a0b1b9b5163fb6f849eee2a14796eeb6f0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B778 11984 bytes

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