Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c5d1918450b4f…

MALICIOUS

PDF

39.5 KB Created: 2020-08-24 19:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0522621c66d943eb6835d6c8bee342a7 SHA-1: 6096e887e67264e88e920359304956025bba8467 SHA-256: c99c5d1918450b4fddb0b390aa0eaf9c5fb860761f3c12f4b201fe0812183f24
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to external content, specifically advertising 'Command and conquer generals free pc'. The primary malicious URL identified is https://ttraff.ru/pify?keyword=command+and+conquer+generals++free+pc, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a coordinated effort to distribute potentially harmful content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=command+and+conquer+generals++free+pc
    • http://files.sanimage.com/uploads/1/3/2/6/132681946/1284866.pdf
    • http://files.maggiejoynt.com/uploads/1/3/2/3/132302941/4b17e.pdf
    • http://files.battambangparish.org/uploads/1/3/0/9/130969154/mexun.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/44045106002.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6362/files/adblock_chrome_mobile_android.pdf
    • https://cdn.shopify.com/s/files/1/0459/7311/0951/files/vurifakik.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/building_planning_and_drawing_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/liberia_flag_photo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/cercle_trigonomtrique_seconde.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duliwoledemovaj.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_off00005c1a.bin
9530eb19700ff3f4811170bba999a781776c58c4b6c4fe8a46f96732a0f2ef42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1A 5508 bytes
font_01_sfnt_off00006eac.bin
455c06eb0ad76322a1db63d0b16975da4dedcd00f7f32b4d2b62f62152944186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAC 10296 bytes

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