Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda25e59badd3dd…

MALICIOUS

PDF

40.8 KB Created: 2021-05-15 08:35:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 171d65b886361af01286ab052588c715 SHA-1: 9c0cab3f5ec703afa097d9df5b2e29bd41b99d41 SHA-256: dbda25e59badd3dd3d785cf6026299076ee51384c747c08e9a10d8bcb8d29070
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. The primary lure appears to be related to game hacks and generators, aiming to trick users into visiting potentially harmful 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-coin-master-hack-game-hack In PDF document text
    • https://www.sd-olimp.hr/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/coun-master_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-free-coins-hack_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_off00004745.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4745 24176 bytes
SHA-256: 581fc810cd429e530a33891f64999e84eb4812710dac3953112e481b00ad2737
font_01_sfnt_off00007e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0B 17880 bytes
SHA-256: b097c0e0a508b19b294d84254edc3a7906d96ed82e768bd7a04e405a1f825274

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