Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b1f35d651c92e0…

MALICIOUS

PDF

53.0 KB Created: 2020-07-29 05:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c61a4ff2ee1517d801df006b820a512 SHA-1: 28640e0afd729488fc60005d7b8d2f1f4330bef0 SHA-256: a9b1f35d651c92e0d868baa64d730143ea582e6dad67c42903303a5dcca4da93
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. It also contains a PDF link farm heuristic, with many links hosted on 'cdn.shopify.com'. The document body, though heavily obfuscated, appears to be related to a 'happy birthday pop up card template free' lure, combined with a visual download button heuristic. These elements suggest a social engineering attack designed to trick users into visiting malicious sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=happy+birthday+pop+up+card+template+free
    • http://files.dicksbook.net/uploads/1/3/2/6/132681979/nowipiwolebo-zelidi.pdf
    • http://files.wingcrafters.com/uploads/1/3/0/8/130814205/7242032.pdf
    • http://files.sailingforthesoul.com/uploads/1/3/0/9/130969346/439eac.pdf
    • http://files.encompass-supports.com/uploads/1/3/1/4/131408415/7240815.pdf
    • http://files.msnlawoffice.com/uploads/1/3/0/7/130775658/tumafapova-jamupebozofurok-worofonefi-netod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1920/5789/files/57578834565.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/gononilijud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0440/3871/7605/files/76229195981.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/zefafope.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/magedefo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/rigewaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/pimatusesasuvetoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/71312957751.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/dunegibatukabegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/nelopuxixurimitonisawog.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_off000091a3.bin
68a44222c124f2b4d93c6b2c8fcadba80989d21731e2b9a1f96eefa5df8bf7b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A3 5196 bytes
font_01_sfnt_off0000a34d.bin
67fbac63040786ceb0ff1da8b4640dcafbcbb7bd982769de24a8f6a0ad642ed1
pdf-font-stream PDF embedded font (sfnt) at offset 0xA34D 10392 bytes