Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c16a26a07e66b3…

MALICIOUS

PDF

39.9 KB Created: 2020-05-13 10:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c71cafebf86b559505858a30f0dac94e SHA-1: a5c2a4676f905382a13772e507c2427e8abbb894 SHA-256: f6c16a26a07e66b354886824e9ecb2ed2fdcd9b203219d3a76256279d4efe8ea
94 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are numerically or generically named, suggesting a link farm designed to lure victims. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for an Android x86 installer. The ML classifier strongly indicates maliciousness, supporting the interpretation of these links as part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://adoptme.info/uploads/1/3/0/6/130639583/130639583.html#android+x86+installer+uefi
    • http://loureview.com/uploads/1/3/0/3/130379466/3166564.pdf
    • http://melodyxlove.org/uploads/1/3/0/9/130969423/zosokugujagituluk.pdf
    • http://erinopen.com/uploads/1/3/0/4/130435652/2d99d1.pdf
    • http://fppga.org/uploads/1/3/0/7/130775045/4604278.pdf
    • http://chiefwebstrategies.com/uploads/1/3/0/5/130590244/ronatoviluwuxis.pdf
    • http://restaurantcostconsulting.com/uploads/1/3/0/6/130604407/fusoguxupaban.pdf
    • http://fallinglava.com/uploads/1/3/0/3/130323155/zodikuwumeji.pdf
    • http://stevnerservice.com/uploads/1/3/0/5/130543064/13530252.pdf
    • http://haribrosptyltd.com/uploads/1/3/0/5/130545185/fezapugot.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_off00006e0a.bin
645be4acddc4b54b137b43948e7e713518eed86064f6432bc1b3820bca845cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0A 11300 bytes

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