Malicious PDF — malware analysis report

Static analysis result for SHA-256 46af386d7a78ebef…

MALICIOUS

PDF

37.8 KB Created: 2020-04-23 01:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b3ae48b21e4a59d4fc32af3d2e1c424 SHA-1: c9ac64f7c46c806f8284c59aafd7650f66622f85 SHA-256: 46af386d7a78ebefa99452c335bfdf17f62027fb583fc4e95f361f8772032c0b
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam and link farms. The document body, though partially corrupted, contains the phrase 'Mic amplifier software for pc free', suggesting a lure to attract users searching for such software. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

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://beeseyecandy.com/uploads/1/3/0/8/130874467/130874467.html#mic+amplifier+software+for+pc+free
    • http://hrmis.es/uploads/1/3/0/2/130289732/zeditefidikiresuweno.pdf
    • http://wevebeentoopatient.com/uploads/1/3/0/5/130543537/monuvikapujopuxa.pdf
    • http://beautybyellav.com/uploads/1/3/0/6/130604147/96a23441.pdf
    • http://windsweptspa.com/uploads/1/3/0/9/130969917/b56fb844.pdf
    • http://scgphotographyny.com/uploads/1/3/1/3/131384281/7236194.pdf
    • http://indenizadpvat.net/uploads/1/3/0/7/130776483/a269a9.pdf
    • http://artsmartbox.com/uploads/1/3/0/6/130639780/ledak.pdf
    • http://justinfrazierrealty.com/uploads/1/3/0/4/130436028/884f798d.pdf
    • http://lukeptacek.com/uploads/1/3/1/4/131437421/kudodexalinod-funopimiwelax.pdf
    • http://segwayitaliatours.com/uploads/1/3/1/6/131607027/zilakukes-daboninosaxa-pifunafutul.pdf
    • http://tcp-tcit.com/uploads/1/3/0/6/130621324/gukatonuzi-zelowafelutowon-dotel.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_off00006de1.bin
367fba353df3a2e1d8864a7b4e3a9b0e4443e1c23723ce542d9f90d9a23dc211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 7432 bytes

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