Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a99a8d4efc661f…

MALICIOUS

PDF

44.5 KB Created: 2020-11-03 20:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26ea8a5cda051e69f67cb6c770c449ea SHA-1: d6edcbcc52a78e4fb3eb0aadf24597bcdfcda648 SHA-256: 31a99a8d4efc661f42e639fc93c8398c116adedffee3e63c52a617723fc81286
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'cctraff.ru', disguised with a seemingly benign keyword. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one pointing to 'vinibakuru.weebly.com'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://cctraff.ru/123?keyword=tongue+tie+symptoms+infants
    • https://vinibakuru.weebly.com/uploads/1/3/4/3/134310820/vixomuke.pdf
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5f9f8fae8d217.pdf
    • https://cdn-cms.f-static.net/uploads/4393898/normal_5f9083ad2b4ff.pdf
    • https://vawavujak.weebly.com/uploads/1/3/4/3/134350312/pixirunorujalenes.pdf
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f8e3546efa43.pdf
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f8763523e074.pdf
    • https://cdn-cms.f-static.net/uploads/4410441/normal_5f93d716115ea.pdf
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8af70aab0f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gitipelut/2019_subaru_forester_aftermarket_accessories.pdf
    • https://s3.amazonaws.com/napoledunadigo/chicago_manual_of_style_indexing.pdf
    • https://s3.amazonaws.com/bulikowexunepov/53357947518.pdf
    • https://s3.amazonaws.com/vapelurowar/minion_dematerializer_guide.pdf
    • https://s3.amazonaws.com/biwubeleba/8186563746.pdf
    • https://s3.amazonaws.com/vobuturinivi/believe_in_yourself_book.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/8346772031.pdf
    • https://s3.amazonaws.com/mijedusovineti/bufakag.pdf
    • https://s3.amazonaws.com/wilugugo/mass_spectrometry_principles_and_applications.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb8.bin
fc3053776dc171529cea234917526220360b409bf78669dc9dac7fbe822d5dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 5144 bytes
font_01_sfnt_off0000813b.bin
2290fb28ab782e697760cba5e21e33f1f3b11b899f200b4486fe1452fdf77bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813B 10356 bytes

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