Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac3ec854aac598d…

MALICIOUS

PDF

39.8 KB Created: 2020-06-07 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18336b510976de824907c877a71336df SHA-1: cf8052ece2ce8bdc208e57dafdc9ffe9d9c861f6 SHA-256: aac3ec854aac598da94ca96bcffaa21bfe446468a9dd4ee644b0f0721ee07ee2
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a malicious campaign.

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://webdisk.thehavenresorts.com/uploads/1/3/1/3/131384301/131384301.html#kise+da+yar+na+bichre
    • http://branchesandroots.net/uploads/1/3/0/6/130639045/xigepenoxewasemade.pdf
    • http://postmaster.kokusaijinzai.com/uploads/1/3/0/8/130813652/87e12c3.pdf
    • http://mrhastieptyltd.com/uploads/1/3/1/6/131607005/d8c1c.pdf
    • http://renaturebeauty.net/uploads/1/3/0/8/130813667/23c833f83479cb.pdf
    • http://mta-sts.mx.midlothianhousecleaning.com/uploads/1/3/0/8/130814088/c2036a5f438f7ea.pdf
    • http://colemanlegalpllc.net/uploads/1/3/0/6/130605283/36ef1c8bb.pdf
    • http://brookekelly.com/uploads/1/3/0/8/130874204/6277087.pdf
    • https://kexukud.files.wordpress.com/2020/06/40308691307.pdf
    • https://fojesezowivi.files.wordpress.com/2020/06/xesumepine.pdf
    • https://gibepav.files.wordpress.com/2020/06/21677119077.pdf
    • https://raxupevifaj316168670.files.wordpress.com/2020/06/78476675136.pdf
    • https://tezoduwob.files.wordpress.com/2020/06/gefovovefijijapuxoviwaj.pdf
    • https://posuwobi.files.wordpress.com/2020/06/tuwedivexiforesijusibaj.pdf
    • https://totinixobi.files.wordpress.com/2020/06/13485567741.pdf
    • https://tuvivamitoti.files.wordpress.com/2020/06/77921025750.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_off00006cfc.bin
87ecff0712b83fbb6fa82b90c328deffc38d9798b1ddf9b6d4f1b660fbfa6b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFC 12524 bytes

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