Malicious PDF — malware analysis report

Static analysis result for SHA-256 12889ebaadf18ca0…

MALICIOUS

PDF

44.8 KB Created: 2020-09-01 03:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 897197f7a740969a28c2240a8d531376 SHA-1: 136792f643a6aa1b9d1ca38d6df8b313c24bc61c SHA-256: 12889ebaadf18ca0eafa8b5cd04f9b306e6117584822680052371be3d4d73043
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the suspicious URL and appears to be a lure for users to click on it. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly suggests this PDF is designed to lead users to malicious infrastructure.

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/wix?keyword=because+of+mr.+terupt+book+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/40987480162.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/mi_maestra_es_un_monstruo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/watch_bleach_episode_54_eng_dub.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/16_personality_factor_questionnaire_16pf.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/11962774781.pdf
    • https://static.usrfiles.com/ugd/4b874d_9712caf03e264dbb8c1b181580e0aa5b.pdf
    • https://static.usrfiles.com/ugd/111c46_37fe4323cb464d7ca1c413c3f7e200da.pdf
    • https://static.usrfiles.com/ugd/b8c837_f244d413efbd4490a8a22d3cdf270720.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/14097989197.pdf
    • https://cdn.shopify.com/s/files/1/0461/5710/3267/files/xikudupagotekitezikit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/nemamojowapaxawolotiget.pdf
    • https://static.usrfiles.com/ugd/2f07a1_ff272b9a69c14155a632272abd0a7d58.pdf
    • https://static.usrfiles.com/ugd/4b7290_a9408d8422c9428fa66467ea84fa39f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a42b00ac241278c55a1596d4feacd.pdf
    • https://static.usrfiles.com/ugd/b8c837_98530b8ca05547a48c03e4009db7ffc4.pdf
    • https://static.usrfiles.com/ugd/2f07a1_b2f6fc57f5c54d7bb2dd2a1719900d8e.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_off000064bb.bin
ac5689c767dbc2ad7463e650450eb82f4cbf4b6b465d3e5c4dd1b80738de89c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5284 bytes
font_01_sfnt_off000076ac.bin
af9db7588eb06193a4237872701834634c80a19b80c7237e4cb4b57d8fd0a3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 9824 bytes
font_02_sfnt_off00009847.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9847 4324 bytes

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