Malicious PDF — malware analysis report

Static analysis result for SHA-256 6365473c2006e609…

MALICIOUS

PDF

58.2 KB Created: 2020-08-12 05:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d0fc4a175d1597a2f5b172afeac045 SHA-1: 264543a5bf97f8f20eb5d274cb7d0fe5d5bdf280 SHA-256: 6365473c2006e609948578b806d4ba33251e749f6969e0d737472870f0da1f9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body itself is heavily obfuscated but contains references to URLs, suggesting an attempt to distribute or link to malicious content, possibly for SEO manipulation or to host further payloads.

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=algorithmics+the+spirit+of+computing+harel+pdf
    • http://files.clclockport.org/uploads/1/3/1/8/131856860/c3f819ad8f.pdf
    • http://mexuvi.theproseccoproject.com/uploads/1/3/0/7/130775607/buguzewageko.pdf
    • http://susaja.e4nursingandhealthcare.com/uploads/1/3/1/4/131453645/6379928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/10191191904.pdf
    • https://cdn.shopify.com/s/files/1/0431/5263/8116/files/kawale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4533/files/xibakaka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5404/files/43885837989.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/95952191487.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/dujosulijazemezonar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8920/files/52817137384.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/naturisirigot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/jk_bank_calendar_2020_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/65542677636.pdf
    • https://cdn.shopify.com/s/files/1/0434/5859/2934/files/tactics_for_toeic_test_1.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009791.bin
e46d59ae4e36b018ec513428827d2ba83316d8538477524afed314aa8d55f428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9791 5440 bytes
font_01_sfnt_off0000a9e8.bin
fd88bfc93aafcf6a9444f8ce9bf9f200d21d2cce3b8d1145f0c86f8dd450ee20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E8 10380 bytes
font_02_sfnt_off0000cd72.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 4324 bytes

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