Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16c4500b86f4795…

MALICIOUS

PDF

44.5 KB Created: 2020-04-18 08:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8de22179eaa00241ccce21ca40a1fe6 SHA-1: 7dc3715e361c5ecd8c150491cb04bc7dc244b777 SHA-256: a16c4500b86f47954b8b30cc0b65bb4da2ad8b04be3b3e84fd34282db8833ad5
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 other PDF files hosted on various domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious or spam-related content through these embedded links.

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://adamhamdy.net/uploads/1/3/0/6/130621960/130621960.html#angular+6+format+number+2+decimal
    • http://smilingfacespreschool.blog/uploads/1/3/0/5/130588482/gexefegab.pdf
    • http://ellenyahnke.com/uploads/1/3/0/6/130620625/3583981.pdf
    • http://myfriendwholovestocook.com/uploads/1/3/1/4/131437980/db0aea93a1.pdf
    • http://aquabluepoolspa1.com/uploads/1/3/1/3/131383609/vezudoxapebim.pdf
    • http://woodlawnchurchofgo.com/uploads/1/3/0/6/130604249/xuvewovitopuz_wamidojuvo_solareje_tinewogosad.pdf
    • http://conspiritomusic.org/uploads/1/3/1/4/131406569/7213393.pdf
    • http://thompsonhorses.com/uploads/1/3/1/3/131379017/d76ebd33.pdf
    • http://realestatecareerhampsteadnc.com/uploads/1/3/0/6/130620679/3974101.pdf
    • http://pollyinparis.com/uploads/1/3/0/6/130604625/04b2b.pdf
    • http://jackdmann.com/uploads/1/3/0/7/130776888/ketigesir-boropulopi.pdf
    • http://naturallawamerica.com/uploads/1/3/0/5/130540246/4b2eb774de9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e44.bin
8b7eca5402e2a19478d8e8abd06b593f9b6cbd0b6a2a4d2315b7df4ed651a437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E44 9216 bytes
font_01_sfnt_off0000917c.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917C 16036 bytes

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