Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac12c4d95abd520…

MALICIOUS

PDF

47.1 KB Created: 2020-08-30 09:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 274c0e471e6f7a2a468608506d447529 SHA-1: bac10728ed444cb7122ffcb5077d54ff268acc37 SHA-256: 0ac12c4d95abd520c8e33240ced3f54826a5e747ec739bda7364476dc88b761b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a search result. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.cc/wix?keyword=mucus+plug+in+spanish
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_92a9a8818da742069e763b7a136ede4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_00705759c42b404bb7035d577849eafa.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1b8ade76229454ea10986fb5444fb58.pdf
    • https://static.usrfiles.com/ugd/b8c837_f98fac90fa214322abfe941517a167fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a3a734cf46e429b9e3999b0607068bf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/give_me_liberty_an_american_history_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4774/files/vedaxupapegukelulijexuvev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2167/files/zugeriwozonija.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6042/files/29687724366.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/tipanukerafanuxiwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/bsc_botany_syllabus_du.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/javano.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6632/files/rate_of_change_exponential_function_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/zavixonupasezuwofazepad.pdf
    • https://static.usrfiles.com/ugd/34ec99_182c7b70c9aa494bb9edd455a5a8425f.pdf
    • https://static.usrfiles.com/ugd/48d9a1_e1262b800d5e4cfcbeae10e284b8e85e.pdf
    • https://static.usrfiles.com/ugd/516793_4c60fa2bcfe74605999f88eaad1bed6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_215ee62a3a1148b38f0730dcae6314dc.pdf
    • https://static.usrfiles.com/ugd/c8a981_ffa9347f5cb34a029376c30f84b02709.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_off00006f45.bin
31d1600a760ddd15ed50e563f9684d410a0c89742ea7716f005c4fdf95d591e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F45 4676 bytes
font_01_sfnt_off00007f1f.bin
a2d5f122eecb2ce8dd067bf83961d291fd90c66deaff84b43d94847625c70bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1F 10104 bytes
font_02_sfnt_off0000a165.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA165 4324 bytes

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