Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbaf8b13be75117…

MALICIOUS

PDF

55.1 KB Created: 2020-07-27 23:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d589eddd0c4c90ac17e4f8afc7c170d SHA-1: 0095bebdb798e1ab5622e27ea0e747a2ea967e37 SHA-256: 9fbaf8b13be75117ddd73130179d909793a9c9c69be62c4d5a3633c89b8cc920
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, appears to be a lure related to 'commis chef interview questions and answers pdf'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector.

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.cc/pify?keyword=commis+chef+interview+questions+and+answers+pdf
    • http://files.coloradowolfandwildlife.com/uploads/1/3/0/8/130813998/788787.pdf
    • http://files.drreyespulm.com/uploads/1/3/1/3/131398059/8487587.pdf
    • http://files.yorkregiondbc.com/uploads/1/3/1/3/131381720/5394006.pdf
    • http://files.captainshreveladygatorsoccer.com/uploads/1/3/1/3/131383954/bikurizejobojevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1943/files/lidixagegepuvuzub.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/fugokipar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/60776703756.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/41717436782.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/53629057483.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/mesurotosu.pdf
    • https://cdn.shopify.com/s/files/1/0439/6836/4702/files/semeserinufosivukusuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8262/0834/files/28686173094.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/livepabovazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/34666996663.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/beziporujilunediwaman.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/1/043

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000995e.bin
9da83cabf04305eb4e03a3f697e1f228b57904a27a4f94e6e819e1f922001947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x995E 5544 bytes
font_01_sfnt_off0000ac22.bin
1b3d71e9ec2e4c3e39ddd3f480d5f7b705c44b8ce7d614fc00f72ecb8cf128c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC22 10248 bytes

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