Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bad1ca290adf50…

MALICIOUS

PDF

44.5 KB Created: 2020-11-09 12:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae02fcbce0a358aa29d1e07a114b56f SHA-1: 17d39a53435b1445a9513369e10017debb46c25a SHA-256: b7bad1ca290adf50a58d8026d00c0ec8af8d10b7dab6b3fff4a984538373e082
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/123?keyword=what+size+football+used+in+high+school', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and a query about football sizes, suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=what+size+football+used+in+high+school
    • https://simipupipez.weebly.com/uploads/1/3/4/7/134716676/ab3ac867ef93.pdf
    • https://nadosivilir.weebly.com/uploads/1/3/4/3/134316305/pejurudobowivevet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c35eabd5-ee8e-40d5-b84a-762f0febbe58/definition_of_social_cultural.pdf
    • https://s3.amazonaws.com/xanebavifamopez/1683477853.pdf
    • https://uploads.strikinglycdn.com/files/b6f07721-1d57-499e-80f6-71a5cc3a831f/60081348777.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/probability_generating_function.pdf
    • https://s3.amazonaws.com/sugowubuf/auto_repair_invoice_form.pdf
    • https://s3.amazonaws.com/fuwawibu/gikuvuvoziduvodupebisabo.pdf
    • https://uploads.strikinglycdn.com/files/3930da70-d746-45a3-8fa6-bc57df2b88bb/maari_song_lyrics_in_tamil.pdf
    • https://s3.amazonaws.com/begijufadi/21465844421.pdf
    • https://uploads.strikinglycdn.com/files/4e002e09-937f-47ce-8289-530965b4a0fb/jofatobuxadulimajadituze.pdf
    • https://uploads.strikinglycdn.com/files/bc054464-48bc-4426-88c2-16b11b5c9b33/pupopikisizekabuvodaf.pdf
    • https://uploads.strikinglycdn.com/files/0cda427d-acfe-4317-a1f3-ab9266eba1ff/38045248695.pdf
    • https://uploads.strikinglycdn.com/files/3ee8118a-d7af-4876-889f-1eb7091fffe2/kuch_kuch_hota_hai_full_movie_downlo.pdf
    • https://s3.amazonaws.com/xojafemori/apush_time_periods_names.pdf
    • https://uploads.strikinglycdn.com/files/084dcb0d-8348-4a57-a02b-a34cd0dc049c/96114587798.pdf
    • https://s3.amazonaws.com/fekaduvopigab/fuwebula.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_off00006f52.bin
8d8d76e2e794be99501cc3dd455e7619e5118db8681edba78cd20399a5cd86ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F52 5392 bytes
font_01_sfnt_off000081be.bin
c83c14a24231761b4aa5bcacc8c9972d3c0b4f83f1defd841c66b4b10109bef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 10292 bytes

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