Malicious PDF — malware analysis report

Static analysis result for SHA-256 9352f4b7ea570650…

MALICIOUS

PDF

52.2 KB Created: 2020-07-28 06:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f8ab982684a73c29f107a038c72144 SHA-1: 4de5555293b1198c15c97fa13418b8790775f83e SHA-256: 9352f4b7ea57065041163129141c8025516bdcbbef7d4a2b6a80c007cf70e744
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'math word problems', suggesting a lure. The primary attack pattern involves redirecting users through a chain of links, ultimately leading to malicious infrastructure.

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.cc/pify?keyword=how+to+answer+math+word+problems
    • http://files.dollartravelers.com/uploads/1/3/0/9/130968958/b860eccd912e.pdf
    • http://files.equistable.co.uk/uploads/1/3/0/7/130739457/1891963.pdf
    • http://files.csavc.org/uploads/1/3/0/7/130739225/sirizaxaxim.pdf
    • http://files.adrianaspina.com/uploads/1/3/0/7/130775828/kuvefisopoxavu.pdf
    • http://files.alphachichico.org/uploads/1/3/0/7/130775953/nakuda-vuwoxola-paxeminafijod.pdf
    • http://files.adrianaspina.com/uploads/1/3/0/7/130775828
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/voribatapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/pexerulebebat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0437/1283/9834/files/63646286903.pdf
    • https://cdn.shopify.com/s/files/1/0433/8515/9843/files/ruromeworegatubogiwulese.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6217/files/walawebiwujevuginu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/11434177003.pdf
    • https://cdn.shopify.com/s/files/1/0437/0871/1080/files/52576306996.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_off000078bf.bin
88da48eb29e2c4febbddd012d72cd922f8485e1c567a5baf7e366d31621115f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 5132 bytes
font_01_sfnt_off00008a04.bin
4f06e40a14cd47d473667cf6ed1a61493c56925da5ccbda8c6846cb9fc837b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A04 10488 bytes
font_02_sfnt_off0000adfa.bin
cc9618900e256a39069df4d65f1d540b234ab68123a8689fe770a3579ee18932		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADFA 16236 bytes

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