Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf94763ee996a05…

MALICIOUS

PDF

35.6 KB Created: 2020-04-12 04:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc9b686dedb5e33b016238a33bd2e5bf SHA-1: 2127f507f2f0110c50613039145436290c8c36cb SHA-256: 4cf94763ee996a05ec9dee01a2e72a3dadcdcff9b75d4db0338ac39cc2604134
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a tactic to drive traffic to potentially malicious or spam-related websites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hopespringchurch.com/uploads/1/3/1/0/131069840/131069840.html#the+underground+railroad+amazon+series
    • http://austinlaminateflooring.com/uploads/1/3/1/3/131397960/kimotozot_kusavakovusora_gilanasiw_bifenena.pdf
    • http://webdestinydesigns.com/uploads/1/3/0/7/130776298/955c1fb2.pdf
    • http://2xgomos.com/uploads/1/3/0/7/130739211/zirabogirutogomi.pdf
    • http://toldmy.com/uploads/1/3/0/2/130287997/5587663.pdf
    • http://exit14theater.com/uploads/1/3/0/7/130776682/xapexuvaraja_rudojeni_tujogimakif_finetilike.pdf
    • http://anondpatra.com/uploads/1/3/1/3/131379685/wonenak_fojozafuliru.pdf
    • http://fortmyersfusionvolleyball.com/uploads/1/3/0/3/130323620/dadejuvuvebe.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_off00006208.bin
cb71151f9301413d1e52059c0b666e4316afa3329aa745147fe69d164f804cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6208 7964 bytes

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