Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdf633460635e48…

MALICIOUS

PDF

38.2 KB Created: 2020-04-15 05:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4ed9871100dd0310efc65f8a11a71881 SHA-1: 6b77f810fa883b8f1e8631f705acf55bd91bf288 SHA-256: 0cdf633460635e4887df8728e13cee233b0b418f90eaa2415118183ca3faf65f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to host malicious content. The document body, though partially obfuscated, contains text related to 'Twitter untuk iphone 4' and a URL, suggesting a phishing or spam lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://natureskindlewholesale.com/uploads/1/3/0/7/130776035/130776035.html#twitter+untuk+iphone+4
    • http://christineszinner.com/uploads/1/3/1/4/131438203/beb52b83.pdf
    • http://littlemews.com/uploads/1/3/0/6/130604361/1570698.pdf
    • http://donnancyscafe.com/uploads/1/3/1/6/131607000/xameveguzebasen.pdf
    • http://singalaunch.com/uploads/1/3/0/7/130740045/2d3085d9.pdf
    • http://bothooq.net/uploads/1/3/0/8/130814100/211560.pdf
    • http://exploringchiangmai.com/uploads/1/3/0/9/130969439/8799791.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057fe.bin
939cdeed1e833c2e0f886e46dff115b20a5bfce22f17c5afef40a06c62284202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57FE 8048 bytes
font_01_sfnt_off0000774d.bin
a70c16f40300af8e4845205b2c6fcfbb0b399b49d4588100e3e89d6fb1b96eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 16316 bytes

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