Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8ed14fce2dc111…

MALICIOUS

PDF

39.8 KB Created: 2020-04-29 03:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6b76032c73ed8d9d58236ff27335365 SHA-1: 2e464c87d967e1887f09a3e01a52a54a18d5cbb4 SHA-256: 6f8ed14fce2dc1115995a8ffa17eedc3df773017d7acf7b25fc0a884674cd3e6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to improve search engine rankings. One prominent link, "http://lykkenkommerindefra.dk/uploads/1/3/0/6/130639805/130639805.html#netflix+app++limit", suggests a phishing or scam attempt related to Netflix. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://lykkenkommerindefra.dk/uploads/1/3/0/6/130639805/130639805.html#netflix+app++limit
    • http://chi-fit.net/uploads/1/3/1/4/131437637/xomagedaralum_nipefav_resewubadidi_jisunatexu.pdf
    • http://anishandshiny.org/uploads/1/3/0/7/130775714/2de7c2.pdf
    • http://searchstchristophers.com/uploads/1/3/0/4/130491008/begupuni.pdf
    • http://roaringforkbiomass.org/uploads/1/3/1/4/131438092/7519869.pdf
    • http://intalented.com/uploads/1/3/1/1/131163908/nebepizex_jepipepikuraniw.pdf
    • http://industryunlockedtv.com/uploads/1/3/0/6/130604141/a72a6b9710df.pdf
    • http://friendsandfamilyvino.com/uploads/1/3/1/4/131438442/419ddad.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_off0000747c.bin
c4a5995244073e5536727a4ab2ca5fe76757a95ec4e92e6e5b733b5a79d1d11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747C 8096 bytes

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