Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5dd4e187d0f14a…

MALICIOUS

PDF

44.2 KB Created: 2021-06-04 03:56:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d9c1311e71f96a1911b7020168595b98 SHA-1: b934dd52fc0a32d492ffda9fbad5c39e9489ae38 SHA-256: 7b5dd4e187d0f14a2edb7a4533366ab73d84e647d5a64b9b65a95f836a7ad1e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator / game hack" lures. The ML classifier also flagged this document as malicious. The embedded links likely lead to the download of a second-stage payload or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/479516143/minecraft-xbox-free-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/pokemon-go-free-spoofing_GM1094591345.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pubg-uc-free-online_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-you-get-free-robux_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_004_off000051a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A4 24512 bytes
SHA-256: 3d0b0016551b25482420d6ba0a21c0510fe757e1e95ea558116f4e8dbd5ff93d
font_01_sfnt_off000089fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FB 18304 bytes
SHA-256: b19b3ee426dc01289f0e43c477ac2043c2327265a5c21cc50be6a14b80435fcf

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