Malicious PDF — malware analysis report

Static analysis result for SHA-256 604099a0c72be6b5…

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 09:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad2f0250bdae48ca0c151fa73055c28b SHA-1: 2b5a86a0144054a0a00decbed5c44a24fc7afea3 SHA-256: 604099a0c72be6b5ec1ca1d70b8fdd61bd30e61c74b26e2639c61f95825a3077
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector pointing to 'https://ttraff.ru/pify?keyword=lightroom+apk+update'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The presence of numerous other links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious URL.

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=lightroom+apk+update
    • http://varej.mrpudaloff.com/uploads/1/3/2/7/132740842/5052961.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/2267806867.pdf
    • https://cdn.shopify.com/s/files/1/0433/5468/5599/files/prelude_bwv_999_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/www._ethiopian_reporter_amharic_newspaper.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/banking_and_finance_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/street_fighter_game_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/53291198437.pdf
    • https://cdn.shopify.com/s/files/1/0431/9694/0448/files/66192433541.pdf
    • https://cdn.shopify.com/s/files/1/0438/1510/8765/files/nutemulago.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/34022121044.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1017/files/osteoarthritis_hip_exercises.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_off000063f6.bin
ba8e93c37e8399f8ae6c5d032f662655b6325357eadaf5ead5d8b4eebf366bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F6 5168 bytes
font_01_sfnt_off00007568.bin
2c38b462226ff71b0611379f190b3dad813dfc9f868708d578c03e7f45e1ef65
pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 9972 bytes