Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db8f464219f4015…

MALICIOUS

PDF

63.9 KB Created: 2020-08-14 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ded28d1dfe19b7e965832858c22673 SHA-1: 04ce2ecd9a1378da78ac269206eeeefeaa098465 SHA-256: 4db8f464219f40158e4020236f73ed474be3d10f49e5c5a19c8e2c64282a8ca1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text referencing 'Alliance data systems corporation annual report 2017' and the wkhtmltopdf tool, suggesting a lure. The presence of numerous external links, many pointing to Shopify domains hosting PDF files, indicates a link farm or SEO poisoning attempt to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=alliance+data+systems+corporation+annual+report+2017
    • http://files.starwheelprinters.org/uploads/1/3/1/3/131379134/71d54f4b59f14a.pdf
    • http://fazewa.justagproductions.com/uploads/1/3/1/4/131482975/salalalum.pdf
    • http://wujisozu.dltigomez.com/uploads/1/3/1/8/131856149/8b312ec817.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4984/files/carboline_859.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/griffiths_electrodynamics_4th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/kevojazilibusimepo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/hp_laserjet_p1102w_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5114/6649/files/82711127508.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/youtube_to_aac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7891/0106/files/91573528567.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/41052735321.pdf
    • https://cdn.shopify.com/s/files/1/0430/5505/5002/files/86255262217.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/87469991075.pdf
    • https://cdn.shopify.com/s/files/1/0434/4833/6536/files/bewekegowesofarasinekofir.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099e7.bin
84c3e9adb390d56ef22a7e5a498feb8ab714f776c8d45e45d1c141690c336e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E7 5716 bytes
font_01_sfnt_off0000ad4c.bin
d79e2394301765d2fc261825299f8a65d0708de181c511f8cdc3cc9db84e27f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4C 15320 bytes
font_02_sfnt_off0000dd1b.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 16060 bytes

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