Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2525b5432e66c6…

MALICIOUS

PDF

45.8 KB Created: 2020-07-30 22:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec55cbc89949d42542ac3a57635c44d9 SHA-1: 203401316e573a760aa2049ca20caa3a8a98f081 SHA-256: bc2525b5432e66c6b38dcb6a48ed5adc99c49ddec884365cea84dc91933da4ef
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be related to 'autocad pdf driver', suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a 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.ru/pify?keyword=autocad+pdf+driver
    • http://files.iemthomas.com/uploads/1/3/2/6/132696030/nivuwebexibuku.pdf
    • http://files.rurallifeatkenyon.com/uploads/1/3/1/3/131384635/rirujik.pdf
    • http://files.trumbullpolicecadets.com/uploads/1/3/1/4/131438397/lawibegubebiganukivo.pdf
    • http://files.aftereuphoria.net/uploads/1/3/1/4/131407698/2084a4da7.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/tazibajokoxas.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/fafutuzibojelibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/sugime.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/bubumazunim.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/23895270642.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/xojipevananukunafenowivub.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/36382078506.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/53631128437.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/lokovuxogug.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/xetowaxilovigikafu.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/
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007581.bin
fe0e1842c2d909f487bbd2838bcc98511f6ddbcfcad9d7be0c6bbf92925e0619
pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 4764 bytes
font_01_sfnt_off000085d0.bin
3f5435d6478f3b4aa9ff40d8a9ed72cb2bcd23b6e6d5d7333eff036e2ab2b3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D0 10632 bytes