Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fcd1244294c727…

MALICIOUS

PDF

39.5 KB Created: 2020-09-08 21:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e5d02567d58c84c7266f1bde1ea0b34 SHA-1: 6d56b6bced53ba9906cf97a6e1e8f57d2f66af86 SHA-256: 18fcd1244294c727960df31df46357d029216d7cb045bf9b02674f0962e70d6d
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 identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=suffix+and+prefix+worksheets+for+6th+grade', which is also flagged as malicious. This suggests the document is part of an SEO link farm designed to drive traffic to malicious sites, likely for further exploitation or malware delivery.

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=suffix+and+prefix+worksheets+for+6th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/89441e_fc278550a6f840db8765cf9e8ef5d6d6.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_3fb711a4650d4b768f190ec1cb9e2d2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbc5d4d42aef426d9b0325a200230972.pdf
    • https://static.usrfiles.com/ugd/0d2908_4a5a3621d23d415890a7fbd8ec3356f8.pdf
    • https://static.usrfiles.com/ugd/0d9a50_68506b1c586b4ab0838169a075606ec3.pdf
    • https://static.usrfiles.com/ugd/87fdc7_0b4aa953ce194549a8538a54f7268791.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/define_abstract_apa_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/131873850.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/737176175.pdf
    • https://static.usrfiles.com/ugd/13ae68_301a3190e828421ab4b8b8bd949f3136.pdf
    • https://static.usrfiles.com/ugd/4bb894_67850e5aa2764d31ad6809a66a6ffbd0.pdf
    • https://static.usrfiles.com/ugd/838e7e_5876e6afc302496a9cf03dabdad7a409.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_off00005a0b.bin
5f99ae45a63e96bbd81bd35e3ef9dcd39e790bda6cc61b4462e150b159ffcc1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0B 5752 bytes
font_01_sfnt_off00006dc0.bin
7c41274fabbddf20592f864fb0c4d01f3e6651f41933d00c86cea2a9d8f42f96
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC0 10292 bytes