Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d7377beca45b0e…

MALICIOUS

PDF

44.1 KB Created: 2021-05-10 15:35:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 039e1a3605f6c5faff7645292a37a3e7 SHA-1: 90659118aa4506725d6023743c9f44660207fb91 SHA-256: 61d7377beca45b0ed328be42e37a770152a6f4c37a260045b3d5ccd0f10e5e37
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors and impersonates the Netflix brand to lure users into clicking on a "Coin Master Hack" generator. The embedded links likely lead to credential phishing sites or further malware downloads. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.xyz/app/406889139/coin-master-hack-ios-12-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.xyz/app/406889139/coin-master-hack-ios-12-game-hack In PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://katalog.perpustakaanlia.net/repository/can-you-give-me-free-robux_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_off0000492a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492A 24236 bytes
SHA-256: 75decf5e64f27d1517d7d008c92c941d8aefe6c82173821b570410a13e9ff33d
font_01_sfnt_off000080b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B5 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA0 17948 bytes
SHA-256: be98af2c8b2a8f415c1138fe429d49ae8e82ec0e8d97b7102e90f5e5fc516930

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