Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a51c8ac217654…

MALICIOUS

PDF

38.4 KB Created: 2020-03-21 16:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a2ba2e91fbecab00d8d85861c59bc61f SHA-1: b18bb0748ecaf05e8095928ad1b49eccffe068dd SHA-256: a91a51c8ac217654ff9bb580db7b6e72bab312121435d1265bfebab963f3b464
190 Risk Score

Malware Insights

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

The PDF contains a direct link to an HTML file disguised as a song download, which is a common lure for malware delivery. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to similar PDF files, suggesting a broad distribution effort. The ML classifier strongly indicated maliciousness, and the structure suggests evasion techniques were employed.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF link points directly to executable/archive payload critical PDF_DIRECT_PAYLOAD_LINK
    PDF contains a clickable HTTP(S) URI whose path ends in an executable, script, shortcut, disk image, or archive extension. Documents can legitimately link to installers, so this is a high-risk delivery indicator rather than a standalone exploit fingerprint.
  • 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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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://gabrielaschaar.com/uploads/1/3/1/1/131164474/131164474.html#main+tera+hero+song+download+pagal.com
    • http://4streets.net/uploads/1/3/0/7/130775878/116ef74627b30.pdf
    • http://anusaf.com/uploads/1/3/0/4/130483739/5733dbe7a.pdf
    • http://rqgenesis.co/uploads/1/3/0/5/130551635/kituvuseruvib.pdf
    • http://nkfanexperience.com/uploads/1/3/0/7/130739169/fe5e70b0dd10.pdf
    • http://crystalclean-maid.com/uploads/1/3/0/5/130546243/59fc1c.pdf
    • http://alex-kwon.com/uploads/1/3/0/2/130271116/06e80.pdf
    • http://mothermoxie.com/uploads/1/3/0/6/130605335/da382a7.pdf
    • http://www.utroop.com/uploads/1/3/0/5/130545396/8550344.pdf
    • http://blueridgecoal.net/uploads/1/3/0/8/130813604/lisubakam-fulawereneg-dimuvo.pdf
    • http://bridgerministries.com/uploads/1/3/0/2/130272557/9794595.pdf
    • http://mail.stmarksdalton.org/uploads/1/3/0/6/130604981/6c466.pdf
    • http://pickard-events.co.uk/uploads/1/3/0/6/130604185/denifekorebuf_dokivotavera_rakozijodi.pdf
    • http://regnaniautoaalliance.com/uploads/1/3/0/8/130813705/zupek_zulitugijov.pdf
    • http://techtronicmobile.com/uploads/1/3/0/5/130542996/1075528.pdf
    • http://libretascorporativas.com/uploads/1/3/0/7/130740196/gugale.pdf
    • http://keysandchange.com/uploads/1/3/0/5/130542781/lidiwamep_pajamegunigakix_zileromaro.pdf
    • http://miami.momotombochocolatefactory.com/uploads/1/3/0/6/130605164/8a976110.pdf
    • http://saeact.com/uploads/1/3/0/4/130435659/9535285.pdf
    • http://mail.groupmelvindesign.com/uploads/1/3/0/6/130621853/9761220.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_off00006df4.bin
e3546bab14230161898fd1e7067f942af123ebb013b5f3b86b11c50e1becfac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 7708 bytes

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