Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9c25f49b53c703…

MALICIOUS

PDF

33.2 KB Created: 2020-04-15 01:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35e2812b7d3912cf44fceba4f9d78ae6 SHA-1: 9f3d612c0bd85d13c7f254bdb1b0c2e63cfdcde2 SHA-256: 8c9c25f49b53c703d52fb2d7f7b5a0b7ebd42c6ac778dd192776a7e3885c5260
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body and extracted links suggest a link farm or SEO spam tactic, potentially used to distribute malware or drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://directroofrestoration.com/uploads/1/3/0/5/130543538/130543538.html#vector+book+cover+designs
    • http://natemalone.com/uploads/1/3/1/4/131438397/waduvu_pidivutado.pdf
    • http://nitro-networks.net/uploads/1/3/0/4/130488172/1435997.pdf
    • http://comedinewithmars.com/uploads/1/3/1/3/131384171/8373373.pdf
    • http://imitari.net/uploads/1/3/0/7/130775297/0da0a5e03c45c.pdf
    • http://robinbryantpottery.com/uploads/1/3/0/7/130776131/3689528078ef.pdf
    • http://vitalitytrading.net/uploads/1/3/0/7/130739121/bijebavexakunowil.pdf
    • http://snmfineart.com/uploads/1/3/0/2/130289494/24c791c6f8f1fe.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_off00005bfc.bin
ad17c5b640ac4d28f9b8dfce5fb9bf9be131d93fb5829ff967b5fc5bb0a6b5f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFC 7420 bytes

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