Malicious PDF — malware analysis report

Static analysis result for SHA-256 e250348bb4f943e9…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 11:13:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 940e9c2bdb962f6acc1753a0cd7e0ba9 SHA-1: 7d7aa7c46d15b23b14978a10b8b6a08bfb74a8cf SHA-256: e250348bb4f943e93111f7a3eb9702c6cb74255edaa692c758c631185bc61386
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to redirectors and known malicious infrastructure, masquerading as a generator for game currency or hacks. It impersonates Facebook to trick users into clicking the malicious link, which is a common tactic for credential phishing or delivering further malware. No scripts were extracted, but the embedded URLs and lure content strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/comment-avoir-des-robux-gratuit-2021-sans-hack-game-hack.
  • 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.tw/app/431946152/comment-avoir-des-robux-gratuit-2021-sans-hack-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/travaille-dans-une-pizzeria-roblox-hack_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/el-mejor-hack-de-roblox-del-mundio_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/rbx-hut_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_004_off0000501e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501E 24760 bytes
SHA-256: 5adb4977a26bfe809e1f4dc2b3cef4835077d7043ef3fd248ca5e00c397ad8b1
font_01_sfnt_off00008907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8907 19416 bytes
SHA-256: 0c64ee17029aa5077e3f7b9097ba9a1efe53547f428688340f7a80fedab15ce2

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