Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d12cf4fe8e2e87…

MALICIOUS

PDF

42.2 KB Created: 2020-08-18 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074c935ad565791bfb76a039ef4c59b3 SHA-1: 8bdc8ed446f44c2d4e7e0169d9779a5b666a7263 SHA-256: 32d12cf4fe8e2e87fabb8e163a08088d7caa4e36f0ae13e61bd2186c3ce47e09
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the text 'Academic reading answer sheet ielts' and the malicious URL, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=academic+reading+answer+sheet+ielts
    • http://files.southernillinoisbreastfeedingcoalition.com/uploads/1/3/1/6/131637136/8902361.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/diraruminitura.pdf
    • https://cdn.shopify.com/s/files/1/0428/7165/2508/files/89924636497.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/noneruvep.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/pipuruvimo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/vidulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/corporate_accounting_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/53384025768.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/kefimotet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/zogakirikilogumenabada.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5708/files/building_construction_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/how_to_uninstall_node.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/81814887244.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_off0000679f.bin
d2d68c6ac9164055512f88d484de9ba650f14c91207bb0cec42d3cbdcd33a03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679F 5436 bytes
font_01_sfnt_off000079ef.bin
63c6a4691a1ba350ba126c50eca29801b6335832db11523dd176d06f20c08a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EF 9860 bytes

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