Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615d2e05984479b…

MALICIOUS

PDF

35.8 KB Created: 2020-08-05 14:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e9136d39f30662121b3c86ccf86ba8e SHA-1: d362771eb8f0485ce3f5ff4cefb6f896edd0c5da SHA-256: 8615d2e05984479bcac8bb20e6e6895d2f4574bbc7544bb045caa122b81c7b45
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking PDF filenames, suggesting a lure to download further content. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack.

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.com/pify?keyword=chuy%25E1%25BB%2583n+pdf+sang+h%25C3%25ACnh+%25E1%25BA%25A3nh
    • http://files.mzstrong.com/uploads/1/3/1/4/131452922/deff2b0.pdf
    • http://files.casapinessuperherorun.com/uploads/1/3/0/9/130969489/9d813e1e.pdf
    • http://files.naleokakoo.org/uploads/1/3/1/6/131636828/lewisan-simukikon-dubugiwovub-busizelipu.pdf
    • http://files.thisdesperatecity.com/uploads/1/3/1/3/131384171/kajemasogoter.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/phonetic_symbols_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4120/files/kovutipev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/tuvunopenowimiduloda.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/kizapufoxuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/fogigenuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/1615690567.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/bagavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/54205828498.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/52690751154.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/70806479273.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/inverter_welding_machine_circuit.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_off00004ad5.bin
ea5e18839ec7305e78e64342a0651e2e8cbefdb9c13fda51e7163d1f5374fd4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD5 5712 bytes
font_01_sfnt_off00005d84.bin
554d1d93fe34e3a1105e39e3991f8d1013ce845d157b98a5258d2eed941f28f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 11188 bytes