Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c213b63ce5d262…

MALICIOUS

PDF

52.4 KB Created: 2020-08-03 17:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a820d44f5b81d8ac46b1a74c4415383 SHA-1: 8ff8736ec2317a5d399c9b3b74415d3c83ef74e6 SHA-256: 76c213b63ce5d262ea21edb0fc08dd4bdb0c3dfa8b416a9e106f47291888270a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=asme+section+viii+division+2+part+5+pdf'. Additionally, it exhibits characteristics of a remote support tool lure and a general download button lure, suggesting an attempt to trick the user into executing a payload or granting remote access. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=asme+section+viii+division+2+part+5+pdf
    • http://files.galvayouth.com/uploads/1/3/1/4/131407539/846336.pdf
    • http://files.palmerhaasch.com/uploads/1/3/1/1/131163836/7159877.pdf
    • http://files.bigstepmissions.org/uploads/1/3/1/1/131164425/abc001a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/marufegikasugaxoxebeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/mike_in_brazil_porn.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/download_os_x_10._11._4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9680354999.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/44622942656.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/fugedokub.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/kukemisupuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/kotesususafizavolamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/bajika.pdf
    • https://cdn.shopify.com/s/files/1/0430/6357/4682/files/how_to_install_packages_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/bavukupetat.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/64129389076.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_off000084f7.bin
7f93e2b32261bcceda071bc05af8c706413b21334feb2f16fd93e8e3a5195bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F7 5572 bytes
font_01_sfnt_off000097e8.bin
029dd8588eb83b71bdd155ea78167ba2d50bd8348872d39862401a27fe03eb20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 14196 bytes

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