Malicious PDF — malware analysis report

Static analysis result for SHA-256 3334177312314636…

MALICIOUS

PDF

32.5 KB Created: 2020-05-18 02:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc89d2ee257e674d6b2552151598d13b SHA-1: b58ac2ea25e6590de5d78178065c8dbffd2db2e7 SHA-256: 333417731231463675ba617c8c75295ee45cd46fa5c1126b220b4dba134abfd4
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various domains. The primary purpose appears to be SEO manipulation or distributing further malicious payloads through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://screfrigeration.com/uploads/1/3/0/4/130488888/130488888.html#arma+3+exile+mission
    • http://amyswickedslush.net/uploads/1/3/0/6/130639882/xizezoneb.pdf
    • http://bobzoltiphoto.com/uploads/1/3/0/2/130270873/6262511.pdf
    • http://unpolishedhealth.com/uploads/1/3/0/7/130739063/tevugufe.pdf
    • http://amininger-copywriter.com/uploads/1/3/0/7/130776255/7516290.pdf
    • http://myspringhill.biz/uploads/1/3/0/8/130874066/gotapaposanuf.pdf
    • http://lifestyleshop.nl/uploads/1/3/0/7/130775306/7132101.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_off00005081.bin
35c22be2a4f2768394a9f541e1b94057595d519fbd81af0601abde343d1f0048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5081 11848 bytes

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