Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20582fd396785fc…

MALICIOUS

PDF

41.5 KB Created: 2020-08-08 21:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8085805a0e3f0dcd0b1850c77091c36b SHA-1: 8ff06eb3cd94f61e0add897d32c1663a7781ae9d SHA-256: c20582fd396785fc55b85e3a9356aec4ae8a47d31ff2cd5fa99c5af07730a6fc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'math worksheets pdf 3rd grade' and a URL that appears to be a lure. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword that suggests an attempt to disguise malicious activity as educational content. The presence of a large number of external PDF links further supports a link farm or SEO poisoning tactic.

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.ru/pify?keyword=math+worksheets+pdf+3rd+grade
    • http://files.hollowsquarepress.com/uploads/1/3/0/7/130775998/zixisudotowamol-wameripetat-kemasopomese.pdf
    • http://files.rikkiducornet.com/uploads/1/3/1/0/131069824/c402b3c067.pdf
    • http://files.navdeepgill.com/uploads/1/3/1/4/131483249/kijanodev-rukufaki-fulefemuzote-fokagu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/fenox.pdf
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/ethical_issues_in_functional_areas_of_business.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/weginemod.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/lomapovujulirebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4691/1643/files/43127569047.pdf
    • https://cdn.shopify.com/s/files/1/0447/5466/5621/files/bayesian_classifier.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2119/files/tabubobilopakewodudadup.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/bonap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6675/files/sotebejajeb.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_off0000626d.bin
52ef774f03aef3e61461dcb543f45de741ab8ecb7da1088b67d5a5c44733efb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 5596 bytes
font_01_sfnt_off00007590.bin
1e03b11065788db3a492598c3611bd6cabbbf8b813dd263d07554a937563d5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 10384 bytes

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