Malicious PDF — malware analysis report

Static analysis result for SHA-256 403726dbfb72fb4c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 01:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84641ca3ab86be963e4413d2ef4eeeb5 SHA-1: d606fbf0486912fc1382b827789a143a2becf509 SHA-256: 403726dbfb72fb4c181d9909c61a19d44a874075c9b18f0cef9b12466cbd3dc4
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=critical+thinking+test+questions+pdf'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains, likely for SEO manipulation. The primary malicious IOC is the ttraff.ru 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.ru/pify?keyword=critical+thinking+test+questions+pdf
    • http://gefini.flashfitnessresults.com/uploads/1/3/0/7/130776493/7835894.pdf
    • http://gixaxe.shepherdscott.com/uploads/1/3/0/7/130776760/dusukoti.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/64780181066.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/44029338343.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/23586529324.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/cessna_310d_performance.pdf
    • https://cdn.shopify.com/s/files/1/0447/3035/1770/files/cds_examination_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/lejigolusa.pdf
    • https://cdn.shopify.com/s/files/1/0450/1661/3014/files/female_equivalent_of_earl.pdf
    • https://cdn.shopify.com/s/files/1/0434/5364/4966/files/15897863139.pdf
    • https://cdn.shopify.com/s/files/1/0449/1352/4891/files/pdf_girl_scout_promise_in_sign_language.pdf
    • https://cdn.shopify.com/s/files/1/0438/5924/7264/files/80362190399.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/zuxivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/saretopimibot.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1688/files/16249023371.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_off000075a2.bin
22837c6f04d6ace4b902671c4991f3be09c9900c94a8fad80f094261e6b975a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 5512 bytes
font_01_sfnt_off00008847.bin
498d4a27a165d84e058837500b726aa522a49abd6602ebeaa1e125a91cb7ce31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8847 9748 bytes

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