Malicious PDF — malware analysis report

Static analysis result for SHA-256 840c293d63039d91…

MALICIOUS

PDF

47.9 KB Created: 2020-07-31 15:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178289a4cb8a4e37ab36718c2ec20eca SHA-1: 34f73d9f8ad3f771d2dd1b915905d547deb12b39 SHA-256: 840c293d63039d9133d626dbbcfefad2ede81d7dd06da17e4e293e5f71308d14
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that points to a link farm, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content. The presence of numerous embedded URLs, including a critical PDF_MALICIOUS_REDIRECTOR_LINK firing, strongly suggests the intent is to redirect users to malicious infrastructure.

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.cc/pify?keyword=comparative+anatomy+of+kidney+in+vertebrates+pdf
    • http://files.dorabramden.com/uploads/1/3/1/4/131406060/retadurudevu.pdf
    • http://files.floraindianadepot.org/uploads/1/3/2/3/132303028/gujumozanizo.pdf
    • http://files.sellsla.net/uploads/1/3/0/8/130873839/6813515.pdf
    • http://files.sellsla.net/uplo
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/mozuzikazasawamowugex.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/jafotibedexagosazurawan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3622/files/sezexiluvuxeti.pdf
    • https://cdn.shopify.com/s/files/1/0434/2012/3285/files/44973696772.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/limezeko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/pawugavubovavanos.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/5290605462.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/dukuvutopulisiwewadedop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/52008671707.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/8733631133.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_off00007e0a.bin
fd4f65a8b6a570c1639c44414499804928d119d77f5cfa9ca7bab15a4b77485d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0A 5332 bytes
font_01_sfnt_off00009018.bin
a886c3dd3577e44faa1f3876e5b761e2fec47cb7fa9a3fad5ffbac26548236e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9018 9992 bytes