Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb3ddec21325ebc…

MALICIOUS

PDF

41.3 KB Created: 2020-08-06 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 686878bdf8bb63e44294678adb6cec16 SHA-1: aa84964679d033d9cbb4193e14cbbb84a5e2a50c SHA-256: 9bb3ddec21325ebc89ab6e3d2c3daefddfddeeac358f0ee2e526528c08dbee89
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body contains text related to 'Approximation questions pdf free download' and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. The presence of a link farm further supports the malicious intent.

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=approximation+questions+pdf+free+download
    • http://files.deepgreenbushschool.org/uploads/1/3/1/4/131437181/c744f96f7.pdf
    • http://files.rioricohistoricalsociety.org/uploads/1/3/1/3/131397981/vagabipi.pdf
    • http://files.daytona100ultra.com/uploads/1/3/1/1/131164275/dezasadiralol-regigebara-voxuwafifit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/nesovikumavofufiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/complex_sql_queries_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/35452592690.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/synapse_rc7_custom_ui.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0450/3748/6238/files/bartending_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/dasewalupobodesalevemi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/86941340385.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/blank_continent_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1685/files/fikorexililedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/96405865802.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_off00005f69.bin
518a90d1e62fcca6bcf59000b2f15934d36d6299b877c28041a5937c53197518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F69 5460 bytes
font_01_sfnt_off000071f6.bin
b23207a60add0b834dee256bcea58daa6dbe715843c076348a77441e821e098e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 11260 bytes

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