Malicious PDF — malware analysis report

Static analysis result for SHA-256 316f9095f30fac2c…

MALICIOUS

PDF

49.9 KB Created: 2020-07-30 16:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70ff5675b76190297a9b23a3a7e46d4f SHA-1: dd0ecf184f644d337912c38dab3a43b47f59ae92 SHA-256: 316f9095f30fac2c88c6895cdc8f9ce30761b47efb40dde908d176851a93087a
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, appears to be a lure related to 'nursing entrance exam question papers'. The linked URL is likely intended to redirect the user to a malicious site or download further malware. The PDF also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO link farm abuse.

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=post+basic+bsc+nursing+entrance+exam+question+papers+pdf
    • http://files.everbloomingcreative.com/uploads/1/3/1/4/131483138/wazosojariv-robisulokivibu-xofinamu.pdf
    • http://files.sapbushfarmstore.com/uploads/1/3/0/7/130738876/abb52.pdf
    • http://files.mrshaolebrownie.com/uploads/1/3/2/6/132682070/2d820.pdf
    • http://files.francespanunto.com/uploads/1/3/2/7/132710624/jafolafomo_mosifuxip_rusavil.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/96886123592.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2243/files/84340107614.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/zomano.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4577/files/21501387227.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/tikojabugolobigexuwopi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/jomenunipuxunoramisifo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/zatedesumasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/tukat.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/70147814441.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/jovesugigemerusodoxujog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15125842299.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/54957109465.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/99825246365.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/43567236414.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e56.bin
2a729eacbc02fe453f385d96000b1756fabfa668e901d434a489aa3188248519
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 5660 bytes
font_01_sfnt_off0000816c.bin
6cde27438225588f8b0e637741de11cbf050c70b7debd69d13bcbac8ebb888e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x816C 10324 bytes
font_02_sfnt_off0000a4a8.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A8 16092 bytes