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) First seen: 2020-08-10
MD5: a2ba2e91fbecab00d8d85861c59bc61f SHA-1: b18bb0748ecaf05e8095928ad1b49eccffe068dd SHA-256: a91a51c8ac217654ff9bb580db7b6e72bab312121435d1265bfebab963f3b464
154 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 In PDF document text
    • http://4streets.net/uploads/1/3/0/7/130775878/116ef74627b30.pdfIn PDF document text
    • http://anusaf.com/uploads/1/3/0/4/130483739/5733dbe7a.pdfIn PDF document text
    • http://rqgenesis.co/uploads/1/3/0/5/130551635/kituvuseruvib.pdfIn PDF document text
    • http://nkfanexperience.com/uploads/1/3/0/7/130739169/fe5e70b0dd10.pdfIn PDF document text
    • http://crystalclean-maid.com/uploads/1/3/0/5/130546243/59fc1c.pdfIn PDF document text
    • http://alex-kwon.com/uploads/1/3/0/2/130271116/06e80.pdfIn PDF document text
    • http://mothermoxie.com/uploads/1/3/0/6/130605335/da382a7.pdfIn PDF document text
    • http://www.utroop.com/uploads/1/3/0/5/130545396/8550344.pdfIn PDF document text
    • http://blueridgecoal.net/uploads/1/3/0/8/130813604/lisubakam-fulawereneg-dimuvo.pdfIn PDF document text
    • http://bridgerministries.com/uploads/1/3/0/2/130272557/9794595.pdfIn PDF document text
    • http://mail.stmarksdalton.org/uploads/1/3/0/6/130604981/6c466.pdfIn PDF document text
    • http://pickard-events.co.uk/uploads/1/3/0/6/130604185/denifekorebuf_dokivotavera_rakozijodi.pdfIn PDF document text
    • http://regnaniautoaalliance.com/uploads/1/3/0/8/130813705/zupek_zulitugijov.pdfIn PDF document text
    • http://techtronicmobile.com/uploads/1/3/0/5/130542996/1075528.pdfIn PDF document text
    • http://libretascorporativas.com/uploads/1/3/0/7/130740196/gugale.pdfIn PDF document text
    • http://keysandchange.com/uploads/1/3/0/5/130542781/lidiwamep_pajamegunigakix_zileromaro.pdfIn PDF document text
    • http://miami.momotombochocolatefactory.com/uploads/1/3/0/6/130605164/8a976110.pdfIn PDF document text
    • http://saeact.com/uploads/1/3/0/4/130435659/9535285.pdfIn PDF document text
    • http://mail.groupmelvindesign.com/uploads/1/3/0/6/130621853/9761220.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 7708 bytes
SHA-256: e3546bab14230161898fd1e7067f942af123ebb013b5f3b86b11c50e1becfac3

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