Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3816f8b5bf6464…

MALICIOUS

PDF

34.6 KB Created: 2020-08-10 04:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86b0bf76008e4c83e787cc0033c29bd8 SHA-1: 3985022460295cb7179d4b56792a825d59d2c151 SHA-256: 8d3816f8b5bf646481495deaef6a14279d56b9b8984d5bbede199d4c0c8a1edd
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to shopify.com, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the string 'Interrai ltcf assessment form pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of numerous PDF links indicates a link farm strategy, likely to improve search engine ranking for malicious content or to distribute malware.

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=interrai+ltcf+assessment+form+pdf
    • http://files.engineerabull.com/uploads/1/3/1/8/131856556/vejilupajukukiw-xijeke.pdf
    • http://gulum.naildesignhouse.com/uploads/1/3/0/7/130775734/bazuvugijewikirix.pdf
    • http://wipux.bonescanoeandcampground.com/uploads/1/3/0/8/130874276/zikobudejitidirojom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/74113696440.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4327/files/62642475501.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/datapisinuwefatukokut.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/fabutimovetoporek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3062/files/jutodek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/10946390080.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/adding_and_subtracting_radicals_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/fatazasemewikumexeliwede.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/mejagotapisibexoronatuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/jotonuzaxodew.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_off00004a18.bin
6333eae01afcd94544e56147139689ac262013c4bdbce71fdd35c6b5b27d6ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A18 5236 bytes
font_01_sfnt_off00005bd1.bin
943cb72f1f8b9bfa0189d8a9857b3c61fdd99658a89ca945be2462a46ccdfbe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD1 9940 bytes

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