Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ce997760ac1d93…

MALICIOUS

PDF

40.8 KB Created: 2021-05-14 06:31:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb413207f25ca882a1d8ec4301e45425 SHA-1: 3245ffde3f8973e8310dd894563206f0cf90686f SHA-256: 51ce997760ac1d937a86b8d427834d8b6a6ea2ffd577358bf254f3d37f5841fc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free in-game currency, such as Coin Master and Roblox. One critical heuristic identified a link to a known malicious redirector infrastructure at https://netcdn.xyz/app/406889139/coin-master-hack-online-link-game-hack. The document body and embedded links suggest a phishing or scam attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-hack-online-link-game-hack In PDF document text
    • http://mbbs.hr/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hacks_GM406889139.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_003_off000047c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C2 23952 bytes
SHA-256: 36b9c11442bd4939219732a76d05a63effaff7ae200f638a9fee168d2a55067e
font_01_sfnt_off00007e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E58 17788 bytes
SHA-256: fe6378a35aaddd1df9c91bfaa88201bdad89d62d9f4d299995ec0f595f057003

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