Malicious PDF — malware analysis report

Static analysis result for SHA-256 7011cd4c346eb55c…

MALICIOUS

PDF

43.2 KB Created: 2020-04-06 15:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b12eb0adfaaa15be51f0812f45b07731 SHA-1: f28a0e60dc8f611120a39b8eac7121bbd3da75dd SHA-256: 7011cd4c346eb55cfa33ef173f97a7dc29862962d9615692a617586083e01fe2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links disguised as a movie trailer, a common lure for users to visit malicious websites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute further content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to automate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • 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://emancipationcenter.com/uploads/1/3/0/3/130323600/130323600.html#percy+jackson+titan%27s+curse+official+movie+trailer+2017+hd
    • http://earnestaudio.com/uploads/1/3/1/4/131409274/6003433.pdf
    • http://movimientomexicano2018.org/uploads/1/3/0/2/130289561/mefap-selifikubuvi.pdf
    • http://barefootbusinessbloggers.com/uploads/1/3/0/4/130483875/5714234.pdf
    • http://ftoservice.com/uploads/1/3/0/6/130639024/wuvibugetuta.pdf
    • http://kimberlinclass.com/uploads/1/3/0/4/130488398/vuwutefitote.pdf
    • http://scoresgrill.ca/uploads/1/3/1/1/131164364/10746.pdf
    • http://vipagenciadeoportunidades.com/uploads/1/3/0/9/130969036/10c5c.pdf
    • http://bea-light.org/uploads/1/3/1/3/131398334/95473e.pdf
    • http://izzaizelan.com/uploads/1/3/0/7/130739936/tajagusul_puwevuragal_vuleguserugam.pdf
    • http://toscanoconstruction.com/uploads/1/3/0/5/130589268/potigasipijujenoliwa.pdf
    • http://concorddruglawyer.com/uploads/1/3/0/4/130489431/zurobaxaw.pdf
    • http://salondusoleilart.com/uploads/1/3/0/6/130604006/fcbf99.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b23.bin
13f7b914ee5cfa06e4a791a6f05ac46bc2e6e71d31219dffedd17a4d33f2734d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B23 8348 bytes
font_01_sfnt_off00008b4c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 16036 bytes

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