Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d7a138126d3740…

MALICIOUS

PDF

75.4 KB Created: 2020-07-24 07:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97038fbea8a17ccde18904bd385b62a4 SHA-1: b92dbd69384c2b64d87b3da8dfce7d010a36be8b SHA-256: 75d7a138126d3740d84f89478d9f4254e8575aacca89732c04501f36e6d88f03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

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=antivirus+software+for+dell+laptop+free
    • http://files.blisstravelservice.com/uploads/1/3/1/3/131398322/pedosimexa.pdf
    • http://files.rosalindmbunting.com/uploads/1/3/0/8/130813108/36e09b.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://files.frugalalien.com/uploads/1/3/1/6/131636984/2432936.pdf
    • http://files.creativestudio23.com/uploads/1/3/0/7/130738850/jonurisaf-tekodex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/65987673535.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/14228443714.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/zofimamerovor.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/84333242908.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/71085222942.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/disirewetixedereweva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jujirufevob.pdf
    • https://cdn.shopify.com/s/files/1/0432/3940/7784/files/94139053324.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/lorisovobenawupuguduf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/6692466386.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/luxemajosufujoperovan.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3d.bin
c0d5ce13e0bc36de8ffe95011e574b53e3b36079a7b267b0b711df798198eb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 5060 bytes
font_01_sfnt_off0000de95.bin
9fd0a26008a626d360fcd45b762af0008104ca4ccff91a65f1babc104c5233b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 15208 bytes
font_02_sfnt_off00010872.bin
d77431ffcec76c53e2acc6032ab1d0df62c7c1a177bf5e0adc8611ab18be8cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16676 bytes

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