Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f06394e979f6de…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 07:25:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e14010000de4600e5a31493e9a8c8ec7 SHA-1: 5a5ca493967d3926198053a31fb9f00e11977c39 SHA-256: a2f06394e979f6de12c92b2a1cfe19df3f78158032836bb2b64a60d5907b6d11
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks, specifically pointing to 'robux-free-com-game-hack'. The document body, though heavily obfuscated, contains references to similar URLs. The presence of embedded links and the nature of the lure suggest an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/robux-free-com-game-hack In PDF document text
    • http://lib.unar.ac.id/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/tiktok-free-folowers-4tiktok-site_GM835599320.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/freespinandcoin_GM406889139.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
stream_004_off00004ec7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC7 24688 bytes
SHA-256: 590d64ff66fafb8e821ce3e6ee5b67fc3ad47dae9d112f2597c57230f8011d21
font_01_sfnt_off00008761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8761 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off00009112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9112 18276 bytes
SHA-256: 0fd65c317a1abc649e3faff400e4768e1aa7d1dd6ac5589c15474ffa47aab2c1

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