Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c1b4261518e08b…

MALICIOUS

PDF

62.7 KB Created: 2020-08-21 05:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27dfe8ba56be2d1aba89949483b0cb0 SHA-1: ee76bd69a50005bbf42634629ef36c2db7ef66ee SHA-256: b6c1b4261518e08b429d04e468951a49494b39b719ae7974a74dd193564e622b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to a link farm infrastructure. The primary malicious URL, https://ttraff.ru/pify?keyword=boot+process+in+windows+server+2008+pdf, is identified as a malicious redirector. This suggests the document is designed to lure users into clicking links that lead to malicious sites, likely for phishing or malware delivery. No scripts were extracted, and the document body was heavily obfuscated.

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=boot+process+in+windows+server+2008+pdf
    • http://vowok.thebattleformaumauisland.com/uploads/1/3/1/4/131408027/timijerawavaxav.pdf
    • http://files.marjoriejohnsonart-design.com/uploads/1/3/0/7/130739340/7396599.pdf
    • http://fapaj.partyplugsclub.com/uploads/1/3/2/8/132814930/b1eaa085229.pdf
    • http://files.regencywestduplex.com/uploads/1/3/2/6/132695467/wafasune-zawutu-jizepeseridixab-gagig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/35735505073.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/revarugogev.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/cost_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0285/files/31850654280.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/29845131082.pdf
    • https://cdn.shopify.com/s/files/1/0447/0777/4618/files/c_linked_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/9966/1223/files/90598972466.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0391/files/cargoes_john_masefield.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.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_off0000a122.bin
75c232cf737cb50b6d606c480a7654fcc10fd0baeccc28e00e9432665c38f2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA122 5576 bytes
font_01_sfnt_off0000b44d.bin
e229ec3644d16d1ae1bb580c84a204816480e7d3576afa899f426dd8dd46d8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44D 10428 bytes
font_02_sfnt_off0000d847.bin
fb09c764af2da29dcd1400a6d7077e59cbae054cb92185a2e15c15daf89e4388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 16176 bytes

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