Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d2c54e7a7d7131…

MALICIOUS

PDF

32.6 KB Created: 2020-08-05 04:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d384d2c779170062f37f6bb10566d6bd SHA-1: 413584f0f0d783f84f2a2d6de955a86db14f6064 SHA-256: 72d2c54e7a7d713117741e6dcd3b8bc51ba53902c34d79cba372717c05779a0d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for a 'maths book pdf'. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or SEO spam.

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=badoni+sir+maths+book+pdf
    • http://files.makatontrainer.com/uploads/1/3/0/7/130776644/311f11f37d5e.pdf
    • http://files.greenhousewivesbathco.com/uploads/1/3/1/3/131383283/9e900ed66dcb.pdf
    • http://files.blahberry.com/uploads/1/3/1/4/131407227/b07d0f5f3f260f.pdf
    • http://files.lotusbud.co.uk/uploads/1/3/1/4/131454190/c698d8cfbd9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.pdf
    • https://cdn.shopify.com/s/files/1/0440/7322/2294/files/jifebelamipenemonor.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/warigedadorusiropekezoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/26616313264.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/83480725468.pdf
    • https://cdn.shopify.com/s/files/1/0429/6130/5756/files/dorobonofenusekejoraxejo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/36801629570.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/33094780491.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/21199505248.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/11081380197.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/abdit_nod_32.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/tokutawoxobojesakekuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/dasidapazafugilabive.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/didawubesomasusexaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/gifomegufibukume.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000426f.bin
27b1f4ceaea906ac392075d7d6297a84a9dd1ea5913d8e1ad35c17fc36401a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x426F 5504 bytes
font_01_sfnt_off000054f8.bin
2d86c6c6c970d7d9015dd9b2b8361b04c9e08b913b9d19110ad8bcac1791b66c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F8 9648 bytes

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