Malicious PDF — malware analysis report

Static analysis result for SHA-256 6490d3ac77005337…

MALICIOUS

PDF

51.2 KB Created: 2020-08-18 14:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dce4dd1edba3c413faacc7b15e8cb8c SHA-1: ec532e42e70932b30276524e6379889277ce0e64 SHA-256: 6490d3ac77005337a28214af53280ffd4304652440b44e6b1ee1d1f5b65d5c05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to direct users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

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=autonics+tk4s-+14rn+manual
    • http://files.pinktshirtday.ca/uploads/1/3/1/3/131398145/bawugutotebixavikoj.pdf
    • http://files.maggieroth.com/uploads/1/3/1/4/131438067/e754f1db730b7.pdf
    • http://files.quietcovetravel.net/uploads/1/3/0/9/130969999/c4c11.pdf
    • http://puleleg.angiessoulspace.com/uploads/1/3/1/3/131384605/80f32be0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/2178590885.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/charango_et_siku.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/82550713669.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/23828364788.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/gulerewinoreruruzov.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/9609827834.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/54272393696.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/hansel_and_gretel_short_story.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/39965162332.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/define_organizational_development.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_off00006f5e.bin
d11a49e804df00125445ed4ad4f035246ad3f4fcf0e568d03d7658147800d1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5E 5172 bytes
font_01_sfnt_off000080eb.bin
a3a0421a0e7f1d97a552893f1b6bcd9156edd41cd063fa2c4377d45d7fe5b533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EB 13248 bytes
font_02_sfnt_off0000aac5.bin
1e6e3dc03332cc53d77147a068cf99156e57e0e2d49a13f8ec5e783694f6e605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC5 16076 bytes

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