Malicious PDF — malware analysis report

Static analysis result for SHA-256 552a9abee3fadef4…

MALICIOUS

PDF

49.2 KB Created: 2020-08-13 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1fc2a7f8aa99e5316b4c25ec2685323 SHA-1: 485f6dca21ce2ffb444aee2ae3dfadd710bfa435 SHA-256: 552a9abee3fadef4e775cc6ad590968986390301b56189f2980f3192293e886c
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wb?keyword=angularjs%20download%20pdf%20file%20from%20server%20example'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/wb?keyword=angularjs%20download%20pdf%20file%20from%20server%20example
    • http://files.supportingspedteachers.org/uploads/1/3/0/9/130970003/rovazejizuson-fezutute.pdf
    • http://files.hssapro.com/uploads/1/3/1/4/131452922/cc50887.pdf
    • http://nogap.biglittlebrains.com/uploads/1/3/0/7/130775413/goxowomavepibob.pdf
    • http://files.jenvie.com/uploads/1/3/1/8/131871535/tudumep_tujemi_nunifewajigo.pdf
    • http://files.tuxedowarehouse.net/uploads/1/3/0/9/130969993/sogamemusejatuvulera.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7238/files/rebinebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/61852771862.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/list_of_awards_and_honours_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0437/8705/9352/files/tigutimazaline.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/14107157710.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/tinkers_construct_best_pickaxe.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/dazosukiji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6016/files/jolodetegibar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ec0.bin
d597e61349c02c1cba641066902b3aebe0068bbe0ead1727a1715b7cc29d422d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC0 5448 bytes
font_01_sfnt_off00008147.bin
5844071d887791a12f1b26e904e84b0fa26b8b3ea83e956136c86f661ba91e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8147 11800 bytes
font_02_sfnt_off0000a9ac.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AC 4324 bytes

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