Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb4ac71e4288fb9…

MALICIOUS

PDF

46.3 KB Created: 2020-03-27 05:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d79ece14858f794bf9f1d094ab9c483c SHA-1: 76d466f1d65065e8efdd844f368d96cefa052e2a SHA-256: bcb4ac71e4288fb95f3e3239b6967fc4d428e6e4ec6d40bc017e9fdeb736a6aa
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO poisoning or traffic redirection. The ML classifier strongly indicated maliciousness. The embedded document body text, while obfuscated, contains URLs that are part of this link farm. The primary attack pattern involves directing users to a network of SEO-optimized PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://hazmatpackingandsupplies.com/uploads/1/3/0/4/130488987/130488987.html#dollar+value+lifo+retail+method+example
    • http://angellashandbeauty.com/uploads/1/3/0/4/130476054/7499354.pdf
    • http://mysticalrockny.com/uploads/1/3/0/6/130620387/libuliva.pdf
    • http://polohouston.com/uploads/1/3/0/7/130739143/2b1e43ac7c.pdf
    • http://negociofuxion.com/uploads/1/3/0/8/130873915/lozikaxefemede.pdf
    • http://rbmusiq.com/uploads/1/3/0/5/130588681/120212.pdf
    • http://whenevr.com/uploads/1/3/0/6/130620464/9bb933cc58.pdf
    • http://marylandslp.com/uploads/1/3/0/6/130603946/kivul-mujotexisave-takovarasojovir-kosokepon.pdf
    • http://406cavoodle.com/uploads/1/3/0/8/130873786/5357205.pdf
    • http://www.improterapia.com/uploads/1/3/0/3/130379117/0d47664918e85.pdf
    • http://littlefinchboutique.org/uploads/1/3/0/4/130435598/823f3b90f41f1b9.pdf
    • http://www.svus.org/uploads/1/3/0/3/130313360/silex.pdf
    • http://aquazulspa1.com/uploads/1/3/0/5/130545643/07fedcd764419e5.pdf
    • http://m.samariacolbert.com/uploads/1/3/0/5/130590474/5c3e33db4d.pdf
    • http://tacomameditationcenter.com/uploads/1/3/0/3/130379083/13d42.pdf
    • http://rayburnpestcontrol.com/uploads/1/3/1/0/131070695/dobon_nasaxeje_kawafagu.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_off00008cac.bin
51db2f00a218d4d4b2d7c8610dd251cdaf2cb34386b9ba07010495664632d042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAC 8120 bytes

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