Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b68af711daac32…

MALICIOUS

PDF

53.5 KB Created: 2021-06-03 10:38:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb73c02f4ce68f305b25ec8e0965ea3b SHA-1: bd68bd4ee601ab43235c0040539f57fbfd2678f8 SHA-256: 52b68af711daac3258e56eac691288ee0298a25fc9c81edd9712b6e90f0add81
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'free generators' and 'game hacks'. The document body and embedded URLs reinforce this by pointing to content related to obtaining free Robux or game cheats. The primary malicious URL identified is https://netcdn.online/app/431946152/how-can-i-get-free-robux-game-hack, which is likely the entry point for a further malicious payload or scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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/431946152/how-can-i-get-free-robux-game-hack In PDF document text
    • https://www.library.kysm.edu.my/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/roblox-pics_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005432.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5432 28660 bytes
SHA-256: c11fc7f599b81a1141f6c25e367cdf973f5a903891a514e428d21a394a4a9e2d
font_01_sfnt_off0000967b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967B 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off0000a072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA072 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000ad84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD84 18512 bytes
SHA-256: 69cba7171cc96811b03769255314e8880e2b1f1f28661a6eda79c3c7ec8a929e

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