Malicious PDF — malware analysis report

Static analysis result for SHA-256 898142eff36321e3…

MALICIOUS

PDF

52.9 KB Created: 2020-08-25 08:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2387dd710a4daa7b8d554a64a0d49ef9 SHA-1: b9c7fca66e82f246223a2941d781022c9ae1bebf SHA-256: 898142eff36321e3505af62f12b22666cf8c455213a8af0f136aad3e5d2879c4
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Malayalam christmas remix songs'. The PDF also contains a large number of embedded links, as flagged by PDF_SEO_LINK_FARM, suggesting a link farm or spamming operation. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=malayalam+christmas+remix+songs
    • http://files.novellychic.com/uploads/1/3/2/6/132695405/1b7055.pdf
    • http://zajaxaxo.cambcollege.com/uploads/1/3/1/1/131164128/sokef_tasudesemupudux_rokurodi.pdf
    • http://lutetefe.bexbourne.co.uk/uploads/1/3/2/7/132712237/f1bde4233dda491.pdf
    • http://files.artsmarttalk.com/uploads/1/3/0/8/130815013/3166905.pdf
    • http://files.ccsoa.net/uploads/1/3/1/6/131637056/bedeminejoviki-gonive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9348/1889/files/93753609547.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5192/files/sony_message_apk_mirror.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sakumuxapiwitisozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4743/files/nopisowufemulateler.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/marlin_model_81.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/50752439020.pdf
    • https://cdn.shopify.com/s/files/1/0465/0467/3430/files/copersucar_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/zaloroxixujafeva.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/76637538304.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/4007115425.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/bagheli_lokgeet_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/les_types_de_centrales_lectriques.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000937d.bin
96639c13922179bf2d78aecb1abc80ebf3d36f9b5c288296aac975848049922b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937D 5388 bytes
font_01_sfnt_off0000a5bc.bin
53195a9bc33ea11c929e4ae549b94298505385893ca22720461d8a4d8e9d2f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5BC 13404 bytes

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