Malicious PDF — malware analysis report

Static analysis result for SHA-256 408bc9093bd3d8ae…

MALICIOUS

PDF

36.0 KB Created: 2020-04-07 19:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0e2cf2e84f0565b5e9c0d9d5f08cb8c SHA-1: 8d6073767793f71bdbfdd6f7c087d695fb7d9021 SHA-256: 408bc9093bd3d8ae47917e6be213b848164b8bbc1f9b3856821a122d0c108fea
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 are hosted on domains designed to appear legitimate and are presented as software installers. The ML classifier strongly indicated maliciousness. The primary attack pattern involves a link farm designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://misfit-world.com/uploads/1/3/0/4/130488165/130488165.html#chrome+offline+installer+latest+version
    • http://palmcityeye.info/uploads/1/3/0/6/130620700/tadulumomavix.pdf
    • http://gfecn.net/uploads/1/3/0/5/130588773/4929991.pdf
    • http://childrensliteratureandreading.org/uploads/1/3/0/3/130323959/dolabedisamojonex.pdf
    • http://myliw.com/uploads/1/3/1/4/131437293/xivipi-muwegafinaxu-pakusukenimed.pdf
    • http://goodgerpinkproductions.com/uploads/1/3/0/8/130813618/tenenilefilad.pdf
    • http://lotusforeststudio.com/uploads/1/3/1/4/131407183/586f599.pdf
    • http://wordsmartz.com/uploads/1/3/0/6/130639810/729c4d2c573ac.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_off00006546.bin
1576aea50b44293853ad1a2ba2a2159b6b8a28a17619124c260bf8a9e6bf3e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 7740 bytes

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