Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f901b6074c9a624…

MALICIOUS

PDF

38.0 KB Created: 2020-04-07 22:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc357f55cdc041fb7c3aaaca9fcb13e7 SHA-1: c675adfd4137512ab1424b667c657b17be303fc5 SHA-256: 6f901b6074c9a624e1de719a0a249480c72a08631dd925017ac42898a54d1c7d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to direct users to malicious content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://studiomusicent.com/uploads/1/3/0/8/130813146/130813146.html#abecedario+para+ni%C3%B1os+de+primaria
    • http://myenhancedbeautyy.net/uploads/1/3/1/3/131379398/8408722.pdf
    • http://bustedwax.net/uploads/1/3/0/9/130969085/womik_xalulosor_nenuli.pdf
    • http://grheatingandcooling.net/uploads/1/3/1/3/131384359/nuvofojor-vorotomiwutum.pdf
    • http://unggulsafetyhealth.com/uploads/1/3/0/5/130543874/dc68aa8a2.pdf
    • http://wilkesbarregeneralmetz.com/uploads/1/3/1/3/131380181/6753953.pdf
    • http://xuxushops.com/uploads/1/3/0/3/130323491/cf632a.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_off00006816.bin
76d3cc13ab6872396eb54c736d66757f8f4cab8c9f648db3e9b3fedee3fb37fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6816 9128 bytes

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