Malicious PDF — malware analysis report

Static analysis result for SHA-256 afde457cd54f5b68…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 16:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b81494214358563460dedb391965aa1 SHA-1: 96b539e31270a0dc4dd4c7ab6b88078fe08a4730 SHA-256: afde457cd54f5b68c980156daca6e89fed52e4c27f632501009ff4091f627cf8
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, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the text 'General aptitude formulas pdf' and the malicious URL, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The primary malicious IOC is the redirector URL.

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=general+aptitude+formulas+pdf
    • http://files.lawrencedavidlegal.com/uploads/1/3/1/4/131408024/0832646d5aaa0f.pdf
    • http://files.jyefinancial.com/uploads/1/3/1/3/131381204/joposanex_vopuxo_tofidapej_dosuputev.pdf
    • http://files.monafishbane.com/uploads/1/3/0/7/130776327/6243292.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/patulekine.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7347/files/58772616166.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8711/files/38218174682.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5650/files/ansi_asq_z1_4_2008.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/73766255230.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/breitling_aerospace_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/soil_erosion_control_methods.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/31962270657.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/64673000673.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/81386773470.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/56898266339.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/bugixasiju.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_off000064b0.bin
a515a634d3c219dcf3acad08480e01d0b42474ce4b42b889f8e796a6a3b61fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 5220 bytes
font_01_sfnt_off0000765d.bin
411b5d5ddcd70553373cc7a7e54a45ffb011d5df7cabc88de18ea39b0043754b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765D 10600 bytes

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