Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb16eae3b8f4e4…

MALICIOUS

PDF

36.4 KB Created: 2020-07-29 13:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 290f3f05f04c951db247c22bcbed042f SHA-1: 804328e1246ff6e93fe196559cc4ca85cf23ff52 SHA-256: bfcb16eae3b8f4e442a9dfb0b5019a3a2b3240ddad4b86264e8c87eaef12f4ca
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its use of a link farm and a redirector URL. The document body, though heavily obfuscated, suggests a lure related to a 'Wetherspoons drinks menu'. The primary malicious indicator is the embedded link to 'ttraff.cc', which is a known malicious redirector. The PDF also contains a large number of links to Shopify domains, likely part of a link farm to improve search engine ranking for 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.cc/pify?keyword=wetherspoons+drinks+menu+pdf
    • http://files.orillialakesidedental.com/uploads/1/3/1/0/131070799/e651e.pdf
    • http://files.vintageblueprintshop.com/uploads/1/3/1/4/131406288/2b181284ea7bf6c.pdf
    • http://files.ucclatrobe.org/uploads/1/3/1/3/131398372/dozaj-regofefux-defes.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/sopawof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/38685271998.pdf
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/ravilesofijuti.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/nofapobokex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58863311498.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/12900720570.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86372263330.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/notadenagefajofakiwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/wesakukobisi.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/napujazidunu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/xeveniniwekofuz.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_off0000543d.bin
bc627c30d0aee949cfd18e0d6fe804fd8b2b87efaa6fb99f83e080ff3e076d14
pdf-font-stream PDF embedded font (sfnt) at offset 0x543D 4996 bytes
font_01_sfnt_off0000651a.bin
b6b618e0d6fb8f50f9082f9c8c18380e04cf2b5b40a069ff7a521d4d15aed683
pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 9248 bytes