Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cedcaaa3d75413…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 05:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb388c06a9b53d80d5b31a877151d157 SHA-1: f045409d93817d26fa53864c0cc7dcdd78ab1ea2 SHA-256: b8cedcaaa3d75413da7467b941048dd9df7e7b07e14d37924441cab48aaf93d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Norme armoire électrique industriel'. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document, likely intended to redirect users to malicious content.

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.com/wix?keyword=norme+armoire+%25C3%25A9lectrique+industriell
    • https://cdn.shopify.com/s/files/1/0440/6670/1477/files/binary_text_converter.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/96479924331.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/92083310871.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d364c43a68e4f07b13599ffe54ea286.pdf
    • https://static.usrfiles.com/ugd/b8c837_f75d0ced24b24eb597af283b00288375.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b723ca448249d7b193bc810be51e90.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a091968c7d047ca85c15014fd2c06eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_473f823dbb494547bd505fd72b2eea48.pdf
    • https://static.usrfiles.com/ugd/b8c837_d771a117df0c467e8870d4fd291b8aa6.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/vavawujawolaxunuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4234/7927/files/physical_asset_management_with_an_introduction_to_iso55000.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/xosejofironunevufanoti.pdf
    • https://cdn.shopify.com/s/files/1/0439/2108/0475/files/gufibujeribatunik.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c5f.bin
66db8bbb95c22a0e7b1b9a2b385902230eb2312b816a348d412a4e8cd3528ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5F 5320 bytes
font_01_sfnt_off00006e11.bin
14bf9cdd424caf9202dbf9fc2531172b8b977abe47c8ff6ed8698700dbe7eebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E11 11168 bytes