Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b6d2fe52da6e7f…

MALICIOUS

PDF

45.2 KB Created: 2020-04-22 02:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8d6b48dbd77e03e8182bb9978d38e973 SHA-1: e490b4ff0166737ca490d66e448b63fc0846497e SHA-256: 07b6d2fe52da6e7f4248481ff81fcb7e0020de047b7cbb81458e325caefcd854
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple heuristics indicating a malicious intent, including ML classification and social engineering lures for browser updates or downloads. It also contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The document body contains a URL that appears to be a lure for downloading an APK, likely related to the browser update lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iamcricket.net/uploads/1/3/0/4/130488619/130488619.html#chrome+terbaru+apk
    • http://agelessphotos.com/uploads/1/3/0/8/130873982/2509042ce49ae.pdf
    • http://websitesbyjan.com/uploads/1/3/0/6/130621382/2acd3d933d61317.pdf
    • http://mollybooth.com/uploads/1/3/1/3/131398234/renexajorejidiwibi.pdf
    • http://cleanandsoberuniversity.org/uploads/1/3/0/2/130289204/3659423.pdf
    • http://oxlot5.com/uploads/1/3/0/5/130588702/f34d8c.pdf
    • http://stoprentny.com/uploads/1/3/0/4/130488994/tufosowepukiwojolid.pdf
    • http://leverage-smart.com/uploads/1/3/1/4/131437660/f78d18ac7a.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_off000087cc.bin
c80796e0b7a33a9aed57ade850155a053284888f244dd0b0b078c8331d4881f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CC 8836 bytes

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