Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a5e4aeea85b9b1…

MALICIOUS

PDF

40.4 KB Created: 2020-09-19 23:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb83333398cc69c9ba57082cffb471c5 SHA-1: fd90ecce124a3859e2aad1a80aa49177bd2bccfe SHA-256: 55a5e4aeea85b9b1cf3f4431689f2abb9a937d836e68da866d51879cf5ff1381
152 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous embedded URLs. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to a known malicious redirector, and PDF_SEO_LINK_FARM indicates a mass of external PDF links. These findings suggest the document's primary purpose is to redirect users to potentially harmful sites, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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/wix?keyword=what+is+otu2
    • http://files.100womenthompson.com/uploads/1/3/2/7/132740564/6e99736da1648fd.pdf
    • http://files.centeredbodywork.com/uploads/1/3/1/4/131437655/jetivijagidavo.pdf
    • http://gofoxof.melissaairy.com/uploads/1/3/0/7/130776485/1821062.pdf
    • http://files.poorginny.com/uploads/1/3/1/4/131407227/81b0211f18c06.pdf
    • http://files.stmarymagdalenelangridge.com/uploads/1/3/1/3/131384589/repab_pufafur.pdf
    • http://files.jannamparker.com/uploads/1/3/2/6/132681602/mufasozozado_pikilixumovi_jojetizurup_dopiragowaduv.pdf
    • http://files.middlecedarwma.com/uploads/1/3/1/3/131379615/fetok.pdf
    • http://wizum.leadingtowellness.com/uploads/1/3/0/8/130874493/lavumuke.pdf
    • http://files.mosaicnorthal.org/uploads/1/3/0/7/130776167/wawikamobuxevafaxuf.pdf
    • http://files.encnonprofits.org/uploads/1/3/1/3/131381602/wimiziludubizi.pdf
    • http://mokokom.moehrbetter.com/uploads/1/3/0/8/130874232/34a474aa69.pdf
    • http://files.mpchouston.org/uploads/1/3/0/8/130813859/wilafo.pdf
    • http://files.scottkeighleyconstruction.com/uploads/1/3/0/7/130738636/975327a149.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/rowdy_rajkumar_2_actress.pdf
    • https://cdn.shopify.com/s/files/1/0434/3942/3655/files/fusexeginafojuza.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632e.bin
433ac83750e28727f11ff1feafd2a417a14620aeeb77cbb54de8f3540b9b3daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 4448 bytes
font_01_sfnt_off0000725c.bin
2b935313282ab5412a251b10741ad9f5b37dd4de2706cf590639adf6465804a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725C 14044 bytes

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