Malicious PDF — malware analysis report

Static analysis result for SHA-256 716d0ffc5d3314ee…

MALICIOUS

PDF

85.4 KB Created: 2020-06-19 01:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bcf1dd6af1f1ee6d9f9b3d2941f66eb SHA-1: c97ba1e4f01a3049e2b6491802494855fe6931c8 SHA-256: 716d0ffc5d3314ee1d390432979d99a2355d1b445432b46688f6a9c747a86718
104 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, suggesting a link farm or a method to distribute further malicious content. The document body, though heavily obfuscated, contains a reference to 'Algebra 1 workbook answers key', likely a lure to entice users to click on the embedded malicious links. The ML classifier strongly indicates maliciousness, and the presence of many external links points towards a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://woodwardmagnetschool.com/uploads/1/3/0/7/130738622/130738622.html#algebra+1+workbook+answers+key
    • http://wijningadefence.nl/uploads/1/3/0/7/130775163/8e11f79ceefcc3c.pdf
    • http://aaliyahmechelle.com/uploads/1/3/0/6/130640219/f13add8bbf5afe.pdf
    • http://glacierbotanicals.com/uploads/1/3/0/7/130776221/66265a3c62c305.pdf
    • http://onedimpletae.com/uploads/1/3/1/4/131407181/xujigubos.pdf
    • http://1e9.undesirable.us/uploads/1/3/0/7/130740450/solunolixerurupa.pdf
    • http://dallaspremiermovers.com/uploads/1/3/0/4/130475959/xukomak.pdf
    • http://i-405corporatecenter.com/uploads/1/3/0/7/130775567/regowod.pdf
    • http://basstv.co.uk/uploads/1/3/0/5/130550748/4670df030dad735.pdf
    • http://whiteboardsandwanderlust.com/uploads/1/3/0/7/130775509/sovoteta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb5.bin
b0625ec336068e78d44464f3c8478ad80a6974b2ed4958eef22d9449a3c2c399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 4952 bytes
font_01_sfnt_off00011daa.bin
0d640f2c93df5050754d49a299c6e37e360d204708fb28505455297c1c79ccec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 13456 bytes

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