Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fa2536831a4d38…

MALICIOUS

PDF

32.6 KB Created: 2020-04-10 01:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c807cbacb804d1dcad23b502724ed4d2 SHA-1: d656dd4042ab2ef6996b8a28146fca24e111d4f6 SHA-256: c4fa2536831a4d38945e16e38d342d802afa2627e7fc69131c5e2481dda8469e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to these external sites, likely for SEO spam or to host further malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ranchita5six0.com/uploads/1/3/1/4/131453401/131453401.html#lfs+slx+yamas%C4%B1
    • http://kayleebeautysupply.com/uploads/1/3/0/7/130739936/395c752597e54cf.pdf
    • http://giapjournals.org/uploads/1/3/0/8/130814596/kuporow.pdf
    • http://nonstopservices.org/uploads/1/3/0/5/130539774/petupoji-supogu-bomiso.pdf
    • http://yogasimplifiedmethod.com/uploads/1/3/0/4/130435652/7209161.pdf
    • http://katletki.com/uploads/1/3/0/6/130620971/2425043.pdf
    • http://stfrancisriorancho.org/uploads/1/3/0/6/130620769/7890447.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b9f.bin
ffe2ec6317adf94e90bb60dffb48bffceef073a4fb0c563c30488f4df42860bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9F 9212 bytes
font_01_sfnt_off00006bc9.bin
a2f0e64d6975656d959a0794b9a965349b6a87240c16eb122ddb64596f86590d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 1704 bytes

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