Malicious PDF — malware analysis report

Static analysis result for SHA-256 8409fc2a90950038…

MALICIOUS

PDF

65.3 KB Created: 2020-08-18 16:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9007ac518683c7e9e694d13c862ed3f SHA-1: 4af9b88c2b11a8348b90f6fd7a9175e5a191e9e2 SHA-256: 8409fc2a909500383e7b666086198f65654a20e9befe22d48efdc16c84848bc4
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=broadsheet+size+in+cm', which is flagged as a malicious redirector. The presence of numerous links, including those hosted on Shopify, suggests a link farm or redirection strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=broadsheet+size+in+cm
    • http://milovexox.reformation.kaisons.org/uploads/1/3/1/4/131407406/6243104.pdf
    • http://vosaleze.aestheticnursecoach.com/uploads/1/3/1/4/131438405/5373900.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/40451661980.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/99873992976.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/92992344551.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/pamajuvokikonevirewewumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/52245443516.pdf
    • https://cdn.shopify.com/s/files/1/0432/4904/1563/files/mobigikijopemijetikis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/fallout3_ps3_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0437/7572/1629/files/evenrude_trolling_motor.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/apartheid_history.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/vawodimefiwuza.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008339.bin
ead9b5a555834dcc90005e1a3e62f55c79b2b954bc07fe79d38ac183cf940885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8339 7072 bytes
font_01_sfnt_off00009b41.bin
d42e0cdcea2f8844119323948533e6aeb75abe5f54f97bf72f0c7692bcd7df9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B41 5036 bytes
font_02_sfnt_off0000ac23.bin
d82230dd77bc36824a1fc6d04c57439bb46a14ef51a59a2ded431495df49696f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC23 6968 bytes
font_03_sfnt_off0000bec7.bin
f699d103e1d152d27a0da63d4d805cc1eb7fc9305227f93c6e36cdc4a0cefb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 13568 bytes
font_04_sfnt_off0000e9cb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 4324 bytes

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