Malicious PDF — malware analysis report

Static analysis result for SHA-256 117c7ffc3a4d346d…

MALICIOUS

PDF

30.9 KB Created: 2020-05-29 13:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d3c047e927ef666ef7da5e31b4ab410 SHA-1: 2df21f4682824197f67cc436f17d154def0edb4f SHA-256: 117c7ffc3a4d346defcafa5a68ce94ba615543c7817d6d7af21f5704a9daa625
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a PDF SEO link farm. The primary URL, http://jenntreado.com/uploads/1/3/1/1/131164569/131164569.html#adana+merkez+patl%25C4%25B1yor+herkes+mp3+indir+bedava, appears to be a lure for free MP3 downloads, which is a common tactic for distributing malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://jenntreado.com/uploads/1/3/1/1/131164569/131164569.html#adana+merkez+patl%25C4%25B1yor+herkes+mp3+indir+bedava
    • http://jrowlanddesigns.com/uploads/1/3/0/7/130738484/dugojerefagiv.pdf
    • http://tekkifoundation.org/uploads/1/3/1/0/131070173/8801783.pdf
    • http://sweetescape.online/uploads/1/3/0/6/130621149/kugarasapa_forunaxo_dutugonima_xivis.pdf
    • http://amieholmesmd.org/uploads/1/3/0/3/130323412/nezagev.pdf
    • http://untroubledminds.com/uploads/1/3/1/4/131407014/69790.pdf
    • http://elpproduction.com/uploads/1/3/0/6/130639980/dalowaku.pdf
    • http://nextgensoftball.com/uploads/1/3/0/5/130590092/30ed5377.pdf
    • http://sonofmanacupuncture.com/uploads/1/3/0/7/130776852/3d946cf39ea2a15.pdf
    • http://thesweetlifedesignercookies.com/uploads/1/3/0/3/130323789/pewejitul_taziluraw_keretefuku.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b77.bin
4b24a384d9bb49bb500cb2f3edc4cbae43df3072108e92394cc46cdabff1175c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B77 10868 bytes

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