Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9e84b3133be2a9…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 04:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 765b94f645130f41da8ba0322ef30d2e SHA-1: f3311a56d14a056f8169f39498c58ab5f4e677a5 SHA-256: 6a9e84b3133be2a941b028da4e589bf470733d88d13bf91904a8aeee13d515c3
162 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains a URL that matches this redirector. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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.
  • 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/wix?keyword=akuntansi+biaya+carter+edisi+14+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_08d055e20f954efa84331490402bc89e.pdf
    • https://static.usrfiles.com/ugd/b8c837_85251ad486794e26b62a980bd3aacaf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_13ab2658bfdd4c2cbc15e13d9d7dfc8b.pdf
    • https://static.usrfiles.com/ugd/57c819_cba75e8972ff4e1f9dffca030f01be9e.pdf
    • https://static.usrfiles.com/ugd/05900a_3052f9561a5545feb9795d890b0ad664.pdf
    • https://static.usrfiles.com/ugd/3f80ec_6e26871990a74b939a0cb65591d65fd8.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_c6fad74889384098bc4a895827ed88a8.pdf
    • https://static.usrfiles.com/ugd/4826f5_7f37d24bde364711b2acf4ba33023e40.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7493162631d4435b092bae9165f26ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e66fdcf727c4596b36f7747d3006f46.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/90421290871.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/easy_guitar_tabs_for_beginners_acoustic.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8439/files/rojebumexakawadazero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632f.bin
cfd7a8a186b8600d8c4a6f46b6e38f86b8835bc5d8ebfdfcebd5bf0b80d63dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 5324 bytes
font_01_sfnt_off00007559.bin
3680915f214d3d4cb496b1477c48e2961f45b348676ae7f93d7625722cbf080c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7559 10440 bytes
font_02_sfnt_off000098e8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E8 4324 bytes

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