Malicious PDF — malware analysis report

Static analysis result for SHA-256 35352ecdc1d1b5e8…

MALICIOUS

PDF

51.5 KB Created: 2020-08-07 21:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 892ce8f9d8cd46ef72d138c3e98d2072 SHA-1: ca01a66d226a50d2da1f9b755c9014646b95ec48 SHA-256: 35352ecdc1d1b5e837672592344ce71e5f2c36f1f1432453c716c556be6e8902
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=toefl+actual+test+reading+pdf`. This suggests the document is designed to redirect users to malicious sites under the guise of providing TOEFL test preparation materials. No scripts were extracted, and the document body was heavily obfuscated.

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=toefl+actual+test+reading+pdf
    • http://files.quiethouseediting.com/uploads/1/3/1/4/131438211/efb43ff9.pdf
    • http://files.thelischka.com/uploads/1/3/1/8/131856306/8ef0a2.pdf
    • http://files.5ivecoffee.com/uploads/1/3/2/6/132682905/bidenidusekaj.pdf
    • http://files.chiminisiberians.com/uploads/1/3/1/8/131871912/3723905.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/3103174697.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/xirawedupekizodij.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/38264391233.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/acting_out_culture_readings_for_critical_inquiry.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/13506773068.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/kofozipuvabulubulu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/le_tissu_cartilagineux.pdf
    • https://cdn.shopify.com/s/files/1/0448/2344/5666/files/autismo_causas.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/ap_intermediate_exam_time_table_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/66698469181.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/jatag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e8.bin
903161082aab6322ab1b499c57ccfb2fd0bee263f4f8e9d1d4b846ff0b19b9e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E8 3080 bytes
font_01_sfnt_off00007304.bin
4db86dc77ba8c9203cef7d8022fb0d1c0a5c77106f8b14985e58abdfb83d04ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7304 5272 bytes
font_02_sfnt_off00008503.bin
122436c4a3a8b77e6390074fa6ea9f2ca64350947046c129ed716e3af3d20929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8503 11396 bytes
font_03_sfnt_off0000a98d.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA98D 16144 bytes

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