Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bf52ba8998004c…

MALICIOUS

PDF

46.6 KB Created: 2020-04-20 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15bfc7849d950015377f55ae51b865fe SHA-1: 86d08203f2c01bea3ba44cb998e9eafd0de341fc SHA-256: b9bf52ba8998004ccaadf1a4a3522ea45a5c6f6c789d82078812cb278f3dc97c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism for other malicious content. The embedded URL 'http://treasures4yourheart.com/uploads/1/3/0/6/130621383/130621383.html#antitubercular+drugs+pdf' further supports the lure of potentially harmful content. The ML classifier strongly indicated maliciousness, aligning with the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://treasures4yourheart.com/uploads/1/3/0/6/130621383/130621383.html#antitubercular+drugs+pdf
    • http://steinerfamilyfarm.com/uploads/1/3/1/4/131408666/255e5b2b9ce71.pdf
    • http://mydiamondmakers.com/uploads/1/3/1/4/131453648/dixomet_vabogapa_zitewavitajet.pdf
    • http://bentleyscience.com/uploads/1/3/0/8/130874252/50516af5f.pdf
    • http://dizzobenz.com/uploads/1/3/0/2/130288534/3bccdc.pdf
    • http://lvcellc.com/uploads/1/3/0/4/130483329/3770433.pdf
    • http://kindlykristenn.com/uploads/1/3/0/2/130291033/44aea13e75541d.pdf
    • http://ashtoninsuranceagents.com/uploads/1/3/0/5/130541662/f26e696d6f6.pdf
    • http://secret-estate.com/uploads/1/3/0/9/130969663/5e375b261add73.pdf
    • http://mrlloydhistory.com/uploads/1/3/0/7/130740264/fbaf6feaeb39533.pdf
    • http://msert.net/uploads/1/3/0/7/130739968/kiwinatat.pdf
    • http://subscription-biling-spotlfy.com/uploads/1/3/0/2/130272483/aecbc048b963f1.pdf
    • http://woundedwarriorwife.com/uploads/1/3/0/4/130436172/zafofaxulo.pdf
    • http://bolocustomholsters.com/uploads/1/3/0/7/130738956/2160732.pdf
    • http://westfieldrapids.org/uploads/1/3/0/4/130483650/vewesupu.pdf
    • http://steinerfamilyfarm.com/uploads
    • 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_off00008b60.bin
b6ca7866faad7c818da5e72d2b50dbd64071a7f59f7d5771e2aa6de7b1d0d5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B60 8836 bytes

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