Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da1e47cf0b80ca8…

MALICIOUS

PDF

41.7 KB Created: 2020-08-23 08:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92ed5e1bb2832c705b21e647927701d4 SHA-1: dd61afe68ed303d1f1046a20c87acc647eaeffe1 SHA-256: 5da1e47cf0b80ca8414d42bfa69aa5afad21d4731456f1122cc752887bbade2f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of many external links suggests an attempt at SEO manipulation to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/pify?keyword=dragonfable+doom+weapons+guide
    • http://files.climbtocollege.com/uploads/1/3/0/8/130813876/2618300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/1029/3669/files/manual_paper_bag_making_machine_video.pdf
    • https://cdn.shopify.com/s/files/1/0461/4334/0697/files/chal_jeevi_laiye_songs_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/bibukenipelirovepokem.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/danganronpa_art_style_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/bleacher_report_epl_predictions_week_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9725/files/65047374984.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/rekipomufesubote.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_off0000649b.bin
922bbc9b5f46bddd8e32b66cf575bc07ff1587e947062ed2d0e8b63f627affd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649B 5592 bytes
font_01_sfnt_off0000778f.bin
5fb006bdcc5ca5f2a70f39b4db28d92e8edd16141e95a0d1fe323773e2866b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10224 bytes

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