Malicious PDF — malware analysis report

Static analysis result for SHA-256 a151157c9b2a9eb1…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 23:51:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 48ae98754f6aed8bcac8a916e14e7999 SHA-1: 0a61571e6d204edf5e00bb7981c261571154450d SHA-256: a151157c9b2a9eb1f9d3409de543cc689e1b5b5064e5b7d8c97db3d6e7a45639
160 Risk Score

Malware Insights

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

The PDF document contains multiple links and a call-to-action phrase, luring users towards a 'free generator / game hack' website. This website is identified as a malicious redirector, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-cheat-apk-free-download-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-catalog-heaven-best-weapons-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-super-checkpoint-cheat-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-cards-by-doing_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/100-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-be-a-hacker-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-birthday-card_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-hack-no-survey-or-human-verification-no-downloads_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-booga-booga-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-hacks-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E7 22628 bytes
SHA-256: 48d87bdd455d3d5c4f6e851d3fbaab3e517808e43f02dfbac7119a64dceb4d00
font_01_sfnt_off00006365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6365 19092 bytes
SHA-256: 49edf52c5cf368a8d41ab1b9b283a900cdd060b2dfdd3a58fc5bfb308b9a1ed9

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