Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0cda79349bf128…

MALICIOUS

PDF

41.0 KB Created: 2020-04-10 01:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 176fb3c29012bd488c9bfe7d902020eb SHA-1: 44728ad616655f7e1106b16c8154a9a6f4d0c673 SHA-256: ff0cda79349bf128a6e32cd500e0f4d0616dcab1a83093a9d76251376a8f8d63
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to seemingly unrelated PDF documents hosted on various domains. The document body, though partially corrupted, contains references to a 'Scantronic 9427 keypad manual' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent of redirecting users to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://civlirightsreenactor.com/uploads/1/3/0/6/130639581/130639581.html#scantronic+9427+keypad+manual
    • http://12x-hybridmuscle.com/uploads/1/3/0/2/130289749/55488bcafff14.pdf
    • http://mysenaraes.com/uploads/1/3/0/2/130288626/1846009.pdf
    • http://cayscards.com/uploads/1/3/0/3/130323286/dofefosuxelifefaxena.pdf
    • http://upkeephomemaintenance.com/uploads/1/3/0/2/130271255/xobatuza.pdf
    • http://discountinventory.ca/uploads/1/3/0/6/130605120/4507620.pdf
    • http://whisp-ir.com/uploads/1/3/1/3/131379636/2765139.pdf
    • http://wigglesandgiggleschildcare.com/uploads/1/3/0/7/130776197/5209058.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_off000060ee.bin
eea790431f54c94ad0083cd9d4ce7b5324e558fc5f2f4c9d1f0a81159751d592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EE 8192 bytes
font_01_sfnt_off0000807a.bin
c6c28444bcd94379862b6cc7f8cfcdbcdaeb026857ccdb099d87626a561054a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807A 16092 bytes

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