Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5932a89481c25d…

MALICIOUS

PDF

36.8 KB Created: 2020-08-15 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00bf644674a6ebcb6c105607e9a6b3fa SHA-1: 605d11e1300397eed2083cedbed8a52b4eba788e SHA-256: 5a5932a89481c25d522aba23ee78b60923f131354e1f4e73fb00ef0a1b13c980
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, ttraff.com, which is flagged as malicious. The document body text, though heavily obfuscated, contains the same URL and mentions 'hidden animal picture puzzles with answers', suggesting a lure. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads. The ML classifier strongly indicates maliciousness.

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=hidden+animal+picture+puzzles+with+answers
    • http://files.cristinavillacreativeyoga.com/uploads/1/3/2/6/132681901/nulobo_xubolovavuxit.pdf
    • http://wivilabes.boondhs.com/uploads/1/3/1/6/131636725/vapanigexezega.pdf
    • http://koval.fletcherspub.com/uploads/1/3/2/6/132683169/gujuku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/lerojoviduwapebuguze.pdf
    • https://cdn.shopify.com/s/files/1/0435/7370/6913/files/yaseen_malayalam_text.pdf
    • https://cdn.shopify.com/s/files/1/0438/8113/6296/files/98593821193.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/85534953152.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/accuweather_warwick_ri.pdf
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/12184405784.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6325/files/niselimunogepozegap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7186/3961/files/linear_bearing_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/10759953665.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/dieta_keto_menu_semanal.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7599/files/gowajukedo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0497/4488/files/cambridge_english_advanced_2_answers.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_off000051e8.bin
ec8382556b8b7a0cc20b29fa6573377707673223e363fa8fb1c30fd6c404c80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E8 5416 bytes
font_01_sfnt_off00006431.bin
3b7da45d5e9597a90c6755c16fe2b1e4a0dbf45578a29c50956942ec12faebab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 9992 bytes

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