Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b665e82be2b1c4…

MALICIOUS

PDF

33.3 KB Created: 2020-04-16 20:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3120b8e9b29416734661af312eaed51e SHA-1: 725cd000f8220189b929a8841aafa82a33af45c1 SHA-256: 50b665e82be2b1c45eb4d2b542ed1ade4b34535b2ff15f7f4c641bf3092ab302
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The document body contains a lure related to a movie title, suggesting a social engineering pretext to drive traffic to these links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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://theleawoodfamilydentist.com/uploads/1/3/1/0/131071210/131071210.html#kathi+sandai+full+movie++isaimini
    • http://eurekaoracle.com/uploads/1/3/0/5/130590700/jukavamobe.pdf
    • http://oregonrescuechallenge.com/uploads/1/3/0/9/130969212/fomowizevazipaka.pdf
    • http://coloradopallet.com/uploads/1/3/1/4/131453821/304699.pdf
    • http://oilyworks.com/uploads/1/3/0/6/130621610/d8f9a99362.pdf
    • http://pearlsandpassports.org/uploads/1/3/0/7/130776152/5688030.pdf
    • http://cascade-computer.com/uploads/1/3/0/8/130814161/464a3a87a5.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_off0000464f.bin
99f136ca5a538b16ffea5503c867cf555c9a6d736402820713d325a48c40a9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x464F 7616 bytes
font_01_sfnt_off00006431.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 16164 bytes

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