Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9f86e8a1aabbdd…

MALICIOUS

PDF

95.6 KB Created: 2020-08-31 15:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343a7ebe4a9d34c994ea81dbff495df5 SHA-1: a9ad1610fa98ecd42eefb5b7efc9af4fc468956f SHA-256: 6a9f86e8a1aabbddd5883a069b0faee621e4acfd34cab2d3e944d750ac635f95
154 Risk Score

Malware Insights

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

The PDF contains embedded links and document body text that direct users to a malicious URL, likely for a phishing or scam campaign. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a known malicious redirector. The ML classifier also strongly indicates maliciousness.

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.club/wix?keyword=generalised+epilepsy+nice+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/078c79_2615d469cc944851949a27af7d61b538.pdf
    • https://static.usrfiles.com/ugd/93c935_ed65807f941a42aea45b8fae39fae4de.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d6c68ede7ab4d0985bd823f7434ac85.pdf
    • https://static.usrfiles.com/ugd/b8c837_f465dcec2a9f4722a01aa92e4240d86a.pdf
    • https://static.usrfiles.com/ugd/edb4a7_eebc2d02f4114fe2aef5a0ec472b4db4.pdf
    • https://static.usrfiles.com/ugd/3826db_d922dd5084444b58a7c6e5eeba8708e8.pdf
    • https://static.usrfiles.com/ugd/599f1c_7b22ef82ebdf49bba12f03e186568f90.pdf
    • https://static.usrfiles.com/ugd/dd4472_a692c3b2c9644e1aba9586a391e8ebe1.pdf
    • https://cdn.shopify.com/s/files/1/0439/4447/6840/files/xakojexopujugufavolon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/weragi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/ardaas_karaan_all_song_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/orange_county_california_school_calendar_2018-19.pdf
    • https://cdn.shopify.com/s/files/1/0438/5246/4293/files/46166213270.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/modern_world_history_textbook_question_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/80525159204.pdf
    • https://cdn.shopify.com/s/files/1/0440/3383/5173/files/bruchrechnen_erklrt.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_off00013b29.bin
ce18186810edf70788267bb81ec6294f695161442726dca067644f2cd4801031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 5372 bytes
font_01_sfnt_off00014d8b.bin
d45aacad263e40f2ff18801e6686bc9a0c888d50b064d2ddae097573ce8cf53e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8B 10224 bytes

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