Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c05f585f56e9b2…

MALICIOUS

PDF

55.5 KB Created: 2020-08-30 13:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5576a487dc52f48bafe1d55463a498a9 SHA-1: 3d76d528338e9660daa99323560eed9aba0f092d SHA-256: 05c05f585f56e9b21df23290563f461a98b3b3521525b10ec412775c40a9961c
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=british+army+sniper+training+manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to the lure and the redirector URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicates the intent to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=british+army+sniper+training+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c2922f2e2c864870b739e3a005f8cb08.pdf
    • https://static.usrfiles.com/ugd/4725f1_123c836c030147b196979fb03e295af5.pdf
    • https://static.usrfiles.com/ugd/3e87bf_82f2a5a48f9f40b8babd94ab954d8da3.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2159/files/vray_3_for_rhino_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4966/files/fikofeze.pdf
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/first_law_of_thermodynamics_in_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/selebeweluga.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/suripuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/1355755596.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/90546955030.pdf
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/piscicultura_familiar_no_amazonas.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/72165922006.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_a8574ef278c84aadae3e1be1164c0a38.pdf
    • https://static.usrfiles.com/ugd/87a178_b25d580f50244e7a87cec7e532cce517.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_off00009c1b.bin
ca5ca36dfad9d74fe657c73a203064eb65dd392c119e62740ef6c952e8a74a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1B 5384 bytes
font_01_sfnt_off0000ae51.bin
0db6b24e9d2343fba7174a44ad37ab380e67cb08a9d54e859639dae92d29af73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 10152 bytes

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