Malicious PDF — malware analysis report

Static analysis result for SHA-256 28aaca34ac049698…

MALICIOUS

PDF

45.7 KB Created: 2020-09-10 23:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027a9c20a2f777080abdde5e6d59dbc8 SHA-1: 6e259100b26dd6c16beab9e89624c562d5fbfbcf SHA-256: 28aaca34ac049698e9d1011131fe515f4d9991c50536a0f450947f0f1df015df
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.me. The document body, though heavily obfuscated, contains references to sheet music and the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=czardas+monti+sheet+music
    • http://wizijot.longislandtu.org/uploads/1/3/0/7/130775734/siligagamul-xemogi-pimitebalobew-lixopufa.pdf
    • http://zofuxipad.livinge.co.uk/uploads/1/3/2/6/132682878/wukegitoweba.pdf
    • http://files.sweetwaterlax.com/uploads/1/3/0/8/130874125/4019235.pdf
    • http://files.ohbotusa.com/uploads/1/3/1/4/131437530/3146425.pdf
    • http://files.mutianyugreatwalltours.com/uploads/1/3/1/4/131406258/1b126f4c35a.pdf
    • http://nenavisom.dinki.me/uploads/1/3/1/6/131606365/gadilokituxefesora.pdf
    • http://files.kpcohuntsville.org/uploads/1/3/1/0/131070207/vexavaminonikej-zedumi-tetogipiw.pdf
    • http://fawafizo.godfrey-lee.org/uploads/1/3/1/4/131407995/salutebemew-rufisutimararez-walibefeju.pdf
    • https://static.usrfiles.com/ugd/0bfb20_056a8a02af2e4e5da2eb147bcc774db3.pdf
    • https://static.usrfiles.com/ugd/4b7290_a2d7224b38c540d281e2131e6a485994.pdf
    • https://static.usrfiles.com/ugd/b8c837_16f109af16784a0ba3310f4d05027548.pdf
    • https://static.usrfiles.com/ugd/b42fd6_1b1248592ceb4c9da6f182d2fde12ce8.pdf
    • https://static.usrfiles.com/ugd/4117a9_05f1c49224d0418a8619f339c4e5db85.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055d4.bin
85a05a9b40619086757ee144cf148561b02582a3a9e76846d9bef29519d3e0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D4 5100 bytes
font_01_sfnt_off00006704.bin
3942b4fe2ff3f60fa633794a6eb7bd879500ed8a7d605d104e6b49ab0c18b51c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6704 14472 bytes
font_02_sfnt_off00009444.bin
fdb6c9292ab0a75b7983ebc4d100a0cb21c33c5809789cafa65d4c1ce838e8a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9444 16232 bytes

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