Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e477cdb2f73ede…

MALICIOUS

PDF

45.8 KB Created: 2021-05-16 13:36:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8daf0512c6df13b7ee7bdd1e931122d9 SHA-1: cb33cf471af5fe44d07505e84040c551bfac7c85 SHA-256: 51e477cdb2f73edeee6f8c610a456af75f22a4599e52f2573d6258b051661cd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically targeting users interested in game hacks and generators. The heuristic firings confirm the presence of malicious redirector infrastructure and a lure for free game content. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/431946152/rbx-claim-game-hack In PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/earn-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B27 24624 bytes
SHA-256: 6ab256ca2ecde4588c6e137947ebd018947a190424630ab0c97555352322e5a5
font_01_sfnt_off000083e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off0000909c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909C 18252 bytes
SHA-256: 07c363ffd4f8b13cbf3de9b0a66d92685f9ea0c409a4ceeea91561e0847d81c0

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