Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe3aed227b044aa…

MALICIOUS

PDF

49.2 KB Created: 2021-06-03 23:46:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eebd81e6d85db7594f6528b7ebf6f5f2 SHA-1: 201928f4b9c61407f8895cf536231a34d6ef2e15 SHA-256: cbe3aed227b044aa4dda44d659a820f32a0a825154febfa24df6658ef5d58b28
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector disguised as a 'free generator / game hack'. The document body, though partially corrupted, contains text related to 'Free Robux Promo Codes 2021' and a URL that aligns with the lure. The presence of numerous PDF links suggests an attempt to drive traffic to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.online/app/431946152/free-robux-promo-codes-2021-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x542E 27032 bytes
SHA-256: 364d515528dbc561b101b790a2fed282907dd8bc76b7d40d54cb54a3907342b0
font_01_sfnt_off0000919b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x919B 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off00009b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5B 19004 bytes
SHA-256: 2ae4233163b81a205a597c97f5f9bceef85a21038461a0399da8d1b6d9f39b0a

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