Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd1ea64408a696b…

MALICIOUS

PDF

60.1 KB Created: 2020-04-01 13:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14c0556ab499285ed4604e8d011872b9 SHA-1: 88fdd1626ed90e93100b4c663cf2e3e7ee108625 SHA-256: 4dd1ea64408a696b238a9c67f41d664e46be9feba091a56189bdc5ac95f5ee0f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDF files on various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that mirrors the content of the PDF_URI heuristic, indicating a potential lure or redirection mechanism. No scripts were extracted from this sample.

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://cmbtp.org/uploads/1/3/1/1/131163718/131163718.html#skyrim+alftand+cathedral+dwarven+mechanism
    • http://jpena-art.com/uploads/1/3/1/3/131383493/voxejozisulaj_seloz.pdf
    • http://melangeemporium.com/uploads/1/3/1/3/131379749/vejerafavazoj_rofikepe.pdf
    • http://visitcaddogap.com/uploads/1/3/0/9/130969280/berazabubeja-parojunagelo-raxejeno.pdf
    • http://74-123-72-1.mgwnet.com/uploads/1/3/0/6/130639136/059af27e43fbcc.pdf
    • http://elektrokat.com/uploads/1/3/0/8/130874492/1155fd.pdf
    • http://rjinspection.com/uploads/1/3/0/6/130622007/11706.pdf
    • http://pomskybreeder.com/uploads/1/3/0/6/130603969/2065459.pdf
    • http://minniecandiepies.com/uploads/1/3/0/7/130738504/borode-rikirasixikujuj-xavakafuv.pdf
    • http://southernstylestudioandmore.com/uploads/1/3/0/5/130588291/b0996595193.pdf
    • http://dennisanddanielle.com/uploads/1/3/0/7/130739196/sosuwawekoki.pdf
    • http://ocalacandystore.com/uploads/1/3/0/3/130313634/6938708.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_off0000b99a.bin
f3daa79eadc837c62d64b5f811004a668d972b66a00068315513511fbd40f6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 8140 bytes
font_01_sfnt_off0000d944.bin
480437884ac0b6d9fcc812d03c56ed28f568666de2b30b44bd42ac9599fc2464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 2680 bytes

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