Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46db4dc28eaa446…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 07:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbdcbb65f1f9fd3e20ffe5173ae0d16c SHA-1: 4ff426ce29dda79df809192d7a741dc856b14e73 SHA-256: a46db4dc28eaa446f062680cc175e0f111b55f3c363e07174429bd40d4685890
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous links pointing to external PDFs, many hosted on Shopify. A low-signal heuristic for a download button lure further supports the malicious intent. The primary IOC is the malicious redirector URL, which is designed to lead users to malicious content.

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/wb?keyword=free%20d
    • http://files.johnboback.com/uploads/1/3/0/7/130776041/merefujedun_raxukodunonef_busipojewik_zerolebiriwona.pdf
    • http://files.smashcakesetc.com/uploads/1/3/1/0/131069899/jatezubokafi-robop.pdf
    • http://files.bettinakoch.net/uploads/1/3/1/0/131070476/3277690.pdf
    • http://files.autopartsau.com/uploads/1/3/0/7/130738572/jebexiz_jopepovikuza_xamigiwomiwabup.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/37526456899.pdf
    • https://cdn.shopify.com/s/files/1/0436/9268/7513/files/mmd_classroom_stage_dl.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/vugun.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/100_doors_challenge_level_57.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/30426300388.pdf
    • https://cdn.shopify.com/s/files/1/0428/3174/1095/files/gastrointestinal_tract.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/32277069263.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/gunudofiwudugorubimen.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/26275317763.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/36517386482.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/aspen_plus_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/79946027230.pdf
    • https://cdn.shopify.com/s/files/1/0436/5264/5017/files/24_hours_a_day_hazelden.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/1/0436/9268/7513/files/mmd_classroom_stage_dl.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007088.bin
eec254011d1dc0041dd4a101a3d0e76c7c82e14081c8c6fc91f666326f3ae876
pdf-font-stream PDF embedded font (sfnt) at offset 0x7088 5508 bytes
font_01_sfnt_off00008353.bin
de1746a7138056cebe2ef3b95e85d61b85574ca73dea319e225143a1c3f32bba
pdf-font-stream PDF embedded font (sfnt) at offset 0x8353 10292 bytes