Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6534031eac9f5c7…

MALICIOUS

PDF

45.5 KB Created: 2020-08-23 18:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 885df2429dda2481ccc947f0f865698d SHA-1: faf0f43cf7945ac653314241a71b5d40a60bf557 SHA-256: a6534031eac9f5c78770e400d084455293b4c0090117531459ccba38eec34607
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and a reference to 'discrete mathematics question and answer pdf', suggesting a lure. The PDF also contains a large number of embedded links to Shopify-hosted PDFs, indicating a link farm strategy.

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=discrete+mathematics+question+and+answer+pdf
    • http://files.iamphoto.co.uk/uploads/1/3/2/7/132710694/d08f51278d47db.pdf
    • http://files.lafayetteschoolrestoration.com/uploads/1/3/1/3/131398357/nutuva.pdf
    • http://files.theclearingfl.com/uploads/1/3/1/3/131380493/275e233a09fb.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/xotesapegaduvobak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/posipimakur.pdf
    • https://cdn.shopify.com/s/files/1/0440/3026/3446/files/9370291946.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5370/files/34518924229.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/alto_k10_automatic_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0453/5540/1371/files/boolean_search_strings.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1885060089.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/23413026109.pdf
    • https://cdn.shopify.com/s/files/1/0436/4402/7038/files/md_form_510.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/vumifewulomobobafo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6632/5157/files/47713444055.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_off0000613d.bin
557897511a01f20fe78163d11abb860ed1211728fa76ca6a61499be46e073a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613D 5464 bytes
font_01_sfnt_off000073b3.bin
6e80aeab26439dcaf7732eaea181843cddbdbdef13e7814f97e695f2a2a3e20a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 12132 bytes
font_02_sfnt_off00009b12.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B12 4324 bytes

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