Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9def3d7bebc9f2…

MALICIOUS

PDF

37.0 KB Created: 2020-06-02 21:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a802f2d1b87b8e18918efab0df217c5 SHA-1: a31d759f281f0e1391fad9d380095de54672f7ea SHA-256: 8a9def3d7bebc9f26bab226e598f315e268f3185b541926896f8e4fe43316065
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text mixed with URLs, suggesting an attempt to obscure the malicious nature of the links. The primary attack pattern appears to be SEO poisoning or a link farm designed to redirect users to potentially harmful content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://mta-sts.mail.silvercloudexpress.com/uploads/1/3/0/7/130775016/130775016.html#bridgeport+manual+mill
    • http://mail.pocdogs.org/uploads/1/3/1/4/131437633/lexikexit.pdf
    • http://terrenceanthony.org/uploads/1/3/0/2/130291658/lulubevu.pdf
    • http://permianmobile.com/uploads/1/3/0/7/130775649/89a801053400.pdf
    • http://onkarvoyages.com/uploads/1/3/0/7/130740112/928c5975cd19.pdf
    • http://mandypickering.com/uploads/1/3/1/4/131452808/247733.pdf
    • http://heatherarnett.com/uploads/1/3/0/7/130776368/delikirif.pdf
    • http://sunshineandsugarbakeshop.com/uploads/1/3/1/0/131069766/8932578.pdf
    • http://bakariweddings.com/uploads/1/3/0/7/130740018/4536854.pdf
    • http://mta-sts.mail.silvercloudexpress.com/uploads/1/3/0/7/130775016/terms.html
    • http://mta-sts.mail.silvercloudexpress.com/uploads/1/3/0/7/130775016/dmca.html
    • http://mta-sts.mail.silvercloudexpress.com/uploads/1/3/0/7/130775016/policy.html
    • https://xunuzivediji.files.wordpress.com/2020/05/fomenaku.pdf
    • https://dameniv.files.wordpress.com/2020/05/subutuvupejeb.pdf
    • https://wubatelevad.files.wordpress.com/2020/05/40191991276.pdf
    • https://vavimanuda.files.wordpress.com/2020/05/14397735146.pdf
    • https://gebotapigi358268599.files.wordpress.com/2020/05/27444369335.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b3.bin
8b6df923f5bb4123ace4d1a7d1f75d2e96349450718bdd91904dbf8afc60e50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 10588 bytes

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