Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffbacacf3cfa0d6…

MALICIOUS

PDF

37.3 KB Created: 2020-05-14 18:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 9e878b53b98bf1fd49e583a6ecc8d501 SHA-1: ec3726468be3cb39ed8caeec049106c60229cf7f SHA-256: 8ffbacacf3cfa0d65ede26d15b4654bc4ccbe8df4192da322a63d8c0af0e3f5c
136 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'piano sheet music' and the URLs themselves follow a pattern indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to one of the many external URLs, likely for phishing or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://clearhomeuk.com/uploads/1/3/0/7/130776006/130776006.html#locked+out+of+heaven+piano+sheet+music PDF link annotation
    • http://talesofatravelingnurse.com/uploads/1/3/0/6/130603834/4917642.pdfIn PDF document text
    • http://abetterbadgercare.com/uploads/1/3/0/7/130739951/7058479.pdfIn PDF document text
    • http://thefragrancekingdom.com/uploads/1/3/1/4/131483065/fixulotagel.pdfIn PDF document text
    • http://purpleoctober.com/uploads/1/3/0/6/130603824/pewowime-vunuje-danezuvesisat.pdfIn PDF document text
    • http://urbanizacion.info/uploads/1/3/0/9/130969406/b2f1be240e37.pdfIn PDF document text
    • http://championlearnershub.com/uploads/1/3/1/4/131413418/sewidukudalimegij.pdfIn PDF document text
    • http://bostonbigscreens.com/uploads/1/3/1/4/131438556/livenixi_jarafopuwatave.pdfIn PDF document text
    • http://polinagavria.com/uploads/1/3/1/0/131070695/1a7a3.pdfIn PDF document text
    • http://massageadventures.net/uploads/1/3/0/4/130476642/bebam.pdfIn PDF document text
    • http://countrysidehomes.net/uploads/1/3/1/4/131453927/zumevajavoga_limirives_sopovum.pdfIn PDF document text
    • http://plussizeweddingdressmassachusetts.com/uploads/1/3/0/6/130604621/3930332.pdfIn PDF document text
    • http://tedchin.com/uploads/1/3/1/4/131452836/70fc4f6c3.pdfIn PDF document text
    • http://plndstore.com/uploads/1/3/1/6/131636719/novur-povamamir-sijomogukijunu-kegefuvudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF2 13600 bytes
SHA-256: f4d7f02c393d68aeae74018ac4426d6178eac85d2e1906a4f0615ff89bbbd8c7

Open this report in the interactive analyzer, or submit your own file for analysis.