Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13f15c70c2d12f0…

MALICIOUS

PDF

48.2 KB Created: 2020-08-25 13:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85c181fb81cc0cfd50e58ecbad30f9a7 SHA-1: b46f41ec97b26b40afbc7e39615e8f8b20f6fd75 SHA-256: c13f15c70c2d12f0cbae90e86b3cb0ce3450d7a2abc1f7bccd1cd5814f8b8efe
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=printable+gradebook+template+editable'. This URL is embedded within the document body, which also contains garbled text alongside the lure 'Printable gradebook template editable'. The file also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on cdn.shopify.com. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=printable+gradebook+template+editable
    • http://vifixazu.robertomaldonado.com/uploads/1/3/0/8/130814328/d15f39e1419184e.pdf
    • http://files.classupdates.org/uploads/1/3/1/0/131070434/d387576433692.pdf
    • http://files.hesswebber.com/uploads/1/3/0/8/130814601/xoxikoxukiti-xokesikopotak-pulejexurinozaj.pdf
    • http://wavojazeb.exportactionusa.com/uploads/1/3/0/7/130775923/nunepokibe_wukizirewazuka_nudodozasedamob.pdf
    • http://files.mrsmarxsfirstgrade.com/uploads/1/3/1/0/131070476/428615.pdf
    • https://cdn.shopify.com/s/files/1/0430/3021/6855/files/53499061339.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/9244070767.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/52840830072.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/leaflet_pneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/48567352834.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/19588538558.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/autoenginuity_scan_tool_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8277/files/consumer_purchase_decision_making_process.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/notetufukapumunuj.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_off00007fbb.bin
5497b187bf7182cf7941571125939196985b38c187607aed3765adccba78cbc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBB 5304 bytes
font_01_sfnt_off0000919f.bin
cd251930efda815930f79fcd03579d1118c6b67fd602394ccc6e0ebb2d8d0dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919F 9928 bytes

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