Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3e8011397bb36f…

MALICIOUS

PDF

41.4 KB Created: 2020-04-15 12:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 09fcfaf2281b122be26677aef9a6f97f SHA-1: 4ab0888a01027896adf8636f56b455abf5b09edc SHA-256: dd3e8011397bb36f52982ebc4cbc621f479ab1df84c0f1b23f62fd458a9637f6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains numerous external links, a common tactic for SEO poisoning or directing users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Google chrome for android devices', suggesting a lure to trick users into visiting the linked URLs, which are likely designed to distribute malware or conduct phishing attacks.

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://sheismommy.com/uploads/1/3/0/4/130435763/130435763.html#google+chrome+for+android+devices
    • http://piccs-iiserm.com/uploads/1/3/0/5/130551164/e1757026.pdf
    • http://odditieschicago.com/uploads/1/3/1/4/131453982/gosekevikaj.pdf
    • http://sarahzahm.com/uploads/1/3/0/2/130272505/6754881.pdf
    • http://hangergames.com/uploads/1/3/0/5/130589145/guzotakaj_fobowadabawitep_xobotarari.pdf
    • http://bizontrackllc.com/uploads/1/3/1/4/131452771/sataz_ninomago.pdf
    • http://goldcoastfootballacademy.com/uploads/1/3/1/4/131437616/rusozatazaxevuv.pdf
    • http://topesteticacenter.com/uploads/1/3/1/3/131383652/tikapewusi.pdf
    • http://hkamarillolaw.com/uploads/1/3/0/2/130288603/5aa0f.pdf
    • http://icrwf.com/uploads/1/3/0/6/130620640/2384780.pdf
    • http://hearthtarot.com/uploads/1/3/0/9/130969465/bace9ce.pdf
    • http://sasting.net/uploads/1/3/0/4/130476417/4315501.pdf
    • http://hearthtarot.com/
    • 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_off00006675.bin
93f5778499dccd8dd23dbbef9157b17ba3f105b6600978473fdb74ee79d37ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6675 7812 bytes
font_01_sfnt_off00008498.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8498 16036 bytes

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