Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f33c485c5939c24…

MALICIOUS

PDF

33.8 KB Created: 2020-08-22 19:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e7e1a229db53e8020a25163f03877f SHA-1: 20593d482b86a81f272004d5bcb1db2adbcf10a2 SHA-256: 8f33c485c5939c2477dad834cad980f59440b58578d3c3805a03384b9897052e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains a URL that appears to be a search result for a microscope, likely a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to Shopify domains, some of which are confirmed benign, but others are unknown or potentially malicious. The primary malicious IOC is the ttraff.com redirector, which is designed to funnel users to further malicious content.

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.com/pify?keyword=bresser+junior+dm400+digital+microscope+software
    • http://fajowexal.fairoaksproducts.com/uploads/1/3/0/8/130813765/6a0224993a65534.pdf
    • http://files.recoveryhumanface.org/uploads/1/3/0/9/130969352/08009cbb4.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/jufafesuresukagutawoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/37803291502.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/16983178097.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/88850694827.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7810/files/73753885967.pdf
    • https://cdn.shopify.com/s/files/1/0437/1995/0485/files/wujuvidodoruwupuwofaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/83396221651.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/75616156141.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/xexezibafewipisufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/vumusuzenefit.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_off000044e6.bin
1917bc8d626ed8c0732b00bf5f0e55f692268323b50a5b33a23803ae7bd83dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44E6 5924 bytes
font_01_sfnt_off00005919.bin
19277f229924a21d567869dbb1a9f04bab160588a04d372fc82db401f3ab06bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5919 9756 bytes

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