Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09d048f2b7ceced…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 00:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0ab62b9e9aaf3e2bf3a10687cefd0cb SHA-1: a43372d2cbfdebd93859c1b3029d156b3438ab12 SHA-256: a09d048f2b7ceced9000cb465c067cfdc1b75b8910066a6a3804401e61b6d84b
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to further malicious content. The document body, though heavily obfuscated, contains text related to an 'English language proficiency test sample PDF' and references wkhtmltopdf, suggesting a social engineering pretext. The presence of a large number of embedded URLs, many pointing to Shopify domains, indicates a link farm strategy to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=english+language+proficiency+test+sample+pdf
    • http://files.milanarielleproductions.com/uploads/1/3/0/8/130874296/d0973.pdf
    • http://files.oscarjohnson.net/uploads/1/3/1/6/131606550/meminoledude.pdf
    • http://bobunu.aftereuphoria.net/uploads/1/3/1/8/131856543/mufuruvafuzuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/36165478466.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/81162805200.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/99149278643.pdf
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/linuxopodob.pdf
    • https://cdn.shopify.com/s/files/1/0454/0334/0968/files/61996310352.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/83336729166.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/61914052496.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/62161668667.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/13004133962.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/relixoguxowefu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636c.bin
3acf8bb3ebba754c81d0648179cac37b88ea51cca6412ac0bbea2f11d31b9601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636C 5628 bytes
font_01_sfnt_off00007675.bin
0a82b75d856884d7140ed29aeae36c448b9a7794bd98dc6f895314f67f1586fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7675 10192 bytes

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