Malicious PDF — malware analysis report

Static analysis result for SHA-256 1694ea9aae434e02…

MALICIOUS

PDF

56.5 KB Created: 2020-09-06 20:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7088402de48836540f399329d9dcdd0d SHA-1: 9d81d91cc63fd7200675f56c8b0b1c3aba951d14 SHA-256: 1694ea9aae434e0256d4b80eb852682cdca79c4cc41f21ae113f8366a9eece67
154 Risk Score

Malware Insights

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

This PDF file contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.me/wix?keyword=bookkeeping+engagement+letter+template'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous other PDF links further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=bookkeeping+engagement+letter+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/06497e_055d48cab6da420c88e1950bab297ceb.pdf
    • https://static.usrfiles.com/ugd/4c4e45_d25bcc8230774ca0832df64b9b5b19d9.pdf
    • https://static.usrfiles.com/ugd/bd1fc0_6f3aceb933944b56aa3f11f2c758458b.pdf
    • https://static.usrfiles.com/ugd/e4ff69_c0aaf6135fba435983c5d3d299efa24a.pdf
    • https://static.usrfiles.com/ugd/fbccce_b8b623f7d9cc45d6bb99f4725e30040e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f19f3f709c24505b265ac7d5dbada1b.pdf
    • https://static.usrfiles.com/ugd/dba42a_611195e7a7934fd3bf65af74a10ce67f.pdf
    • https://static.usrfiles.com/ugd/96768c_875022b98653434a9e03d7a5c4574c68.pdf
    • https://static.usrfiles.com/ugd/90661f_8e7d6b1d5c024f1d81b36193973e9d79.pdf
    • https://static.usrfiles.com/ugd/ab922d_e1b633c0a91948678abb5278d80b183e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cf83f491a9749a1b00babc78116eb85.pdf
    • https://static.usrfiles.com/ugd/cafc24_ea615e59e62b4418b347ae62d1ef9eb5.pdf
    • https://static.usrfiles.com/ugd/1acd69_e8eaf1f981044b6783d0300af5ce0c4f.pdf
    • https://static.usrfiles.com/ugd/fedf23_93b4e3388e5d4c4887fb521702d54bbc.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_off00009dfd.bin
60e38fc2c54075d56ba14bb91dc7572f5df512fbe20c1cee5e51443efb9f7bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFD 5072 bytes
font_01_sfnt_off0000af34.bin
204f4e7c9bd8ec0c07837a1d5da06484d5e1cadae13d11acf6f3632209697e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 11048 bytes

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