Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d8ed345b2d1180…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 17:35:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0c540d13afcf8c3292b836b14e289d59 SHA-1: 510f8e7ba2e97d48c2d52d90a2ab3f6559853f74 SHA-256: 57d8ed345b2d118091aad11b37ad13a7b106c8d95c7a6c616dd8a5a620e3ac69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a URL that likely hosts malicious content. The document body also contains this URL, reinforcing the lure. While no scripts were extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to trick the user into downloading a secondary payload.

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/479516143/how-to-get-minecraft-for-free-on-android-device-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-good-free-lvl6_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/gamefreaksz-co-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-cheat-tool-download-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/speed-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-2021-september_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-do-people-make-roblox-hack-tools_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hackear-roblox-cr7_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-hack-on-phone-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-coding-classes-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/sonic-boom-shirt-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-retail-tycoon-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/ap-get-free-robux-and-tips-for-roblox-2021_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
font_00_sfnt_off0000338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x338E 21884 bytes
SHA-256: 2de98957889366e1c508aebfd78e554919daa719bd99a75acba862599652c8ab
font_01_sfnt_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 18616 bytes
SHA-256: 54a0671c03b3cf1f3bb53e1ad2af697eab54dc928557e8ed7be860ed48ff46e3

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