Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb1f485d2a517a9…

MALICIOUS

PDF

35.2 KB Created: 2020-05-15 00:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2d13ace1ca3dd75e70b5c9f3fe23e9 SHA-1: 5161c8bc578617e29953b8a5ba0ddfd807070f28 SHA-256: 2eb1f485d2a517a9b28a3c46b865053a8f91c4c2a4c817351bb2ae643711d90b
96 Risk Score

Malware Insights

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

The PDF document is designed as a lure, masquerading as an answer key for 'Eureka math'. It contains a significant number of embedded external links, indicative of a link farm or SEO poisoning tactic. The primary function appears to be directing users to a large collection of other PDF files hosted on various domains. No scripts were extracted, and the document body itself is heavily obfuscated, but the heuristic firings strongly suggest a malicious intent to distribute content via a link farm.

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://yksivloerkleden.nl/uploads/1/3/0/4/130435925/130435925.html#eureka+math+answers+key+grade+7
    • http://shreejicleaningservices.com/uploads/1/3/0/6/130605248/4162058.pdf
    • http://tarjetasdepapel.com/uploads/1/3/1/6/131637362/67a8b25.pdf
    • http://bedreinnsikt.net/uploads/1/3/0/6/130604956/bevilitoz.pdf
    • http://custom-granite.info/uploads/1/3/0/4/130488861/fufako.pdf
    • http://lucasmidisbr.com/uploads/1/3/1/4/131437025/gaboviwijajo-jinowanegezane-somuzer.pdf
    • http://luxliquidator.com/uploads/1/3/0/7/130738894/2d2cd.pdf
    • http://cequime.com/uploads/1/3/0/5/130540026/3b01b4403.pdf
    • http://m2enterprises.org/uploads/1/3/1/6/131637034/3163433.pdf
    • http://barbarascateringservices.com/uploads/1/3/1/8/131857562/fuluf.pdf
    • http://mbezmalinovicpsyd.com/uploads/1/3/1/6/131607022/lexogovevefuseditode.pdf
    • http://taxinetworkgeelong.company/uploads/1/3/1/6/131637140/bagidawigeme_dugolub_jebuwoxopiko.pdf
    • http://tnqueenbees.com/uploads/1/3/0/7/130775358/77e374f4f41c.pdf
    • http://renustone.ca/uploads/1/3/0/5/130539726/keganakajo.pdf
    • http://jesvegan.com/uploads/1/3/0/4/130436431/mamuvimamakev.pdf
    • http://sonomacountypp.com/uploads/1/3/0/5/130550912/dozakelewedid.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_off00005ed0.bin
ed69348ddfefd6a35ec981d7e84f4cbb3036dbfdb5cf40ecaf8f91e2f9343859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED0 10096 bytes

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