Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ceda8b5c354ae1e…

MALICIOUS

PDF

35.4 KB Created: 2021-06-22 05:05:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f207fdf239ff7f72430be66a9c690e8c SHA-1: 479b2def4cea3af495886f1d2f336a6f8bcf0333 SHA-256: 8ceda8b5c354ae1ecd5ffc7f4cd5b4503b4c334896f4295b30d28fda3ee412b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector, disguised as a 'free generator' or 'game hack'. The document body explicitly mentions 'How To Get Free Robux On A Phone Easy', reinforcing the lure. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack.

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.co/app/431946152/how-to-get-free-robux-on-a-phone-easy-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/i-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/goo-gl-wx0ofq-free-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-block-games-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-but_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/robux-hack-working-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-co_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/robux-free-promo-codes_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_002_off0000300b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x300B 23108 bytes
SHA-256: 27da8410bfbe8cb2a303520e0aefc7d03778d389ab114a74dadc647c2b900f36
font_01_sfnt_off00006428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 19484 bytes
SHA-256: b5f6b80da6439d3fdef65af29da005f923970a427166f7b00aa586b01b90335a

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