Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4c7c81bfc1827b…

MALICIOUS

PDF

40.8 KB Created: 2020-08-25 10:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fcaae4f2e50b26d57cf80c83f15fa20 SHA-1: 54d4bbe00357691f8feb84f1e4960ac296a9916f SHA-256: 8a4c7c81bfc1827b75075c7a5d16f1e78a3867e7912294316c113406cc209be1
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to obscure malicious destinations. One of these links, to 'ttraff.com', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to lesson plans and the tool 'wkhtmltopdf', suggesting a lure document. The presence of numerous Shopify links, while many are benign, contributes to the overall link farm characteristic.

Heuristics 3

  • 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.
  • 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=simple+lesson+plan+template+pdf
    • http://xivovum.triplecrownlacrosse.com/uploads/1/3/1/4/131453558/detax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/beekeeping_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/zelamosovuwot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/lebamutefafuwuvepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/searchview_menu_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0457/3754/1798/files/kudepiraziguvipomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/88087021929.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/byousoku_5_centimeter_ost.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/59743916812.pdf
    • https://cdn.shopify.com/s/files/1/0437/5891/1649/files/adobe_photoshop_touch_for_android_latest_version.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_off00006168.bin
9bade656a7e424d60074d6b42f96b29c4af142b244ce45eb5eb6899c445bdd9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 5192 bytes
font_01_sfnt_off000072fb.bin
205447fd6085013f6123fe564696076642f0b7e487a21a3f97b0c58d16d0d6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FB 10528 bytes

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