Malicious PDF — malware analysis report

Static analysis result for SHA-256 8247557f4c91da8a…

MALICIOUS

PDF

46.7 KB Created: 2021-05-11 00:00:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7345225d0e0c4019c976705c652a41fb SHA-1: 5a9c4bbcf4934563e01da59f7e44dbfc195e58be SHA-256: 8247557f4c91da8ad827ae93fde26cb71447c130f0cf88c3f2661e4a4b1a990b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The embedded URL, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-verification-2021-game-hack', is a primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/how-to-get-free-robux-without-verification-2021-game-hack In PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/robux-offer-wall_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/real-free-robux-generator_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_off000047b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47B3 25632 bytes
SHA-256: 6e0369bc369c70161dbeb49d826122bcd6f875ca64523abb537271302c4050ff
font_01_sfnt_off0000839e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839E 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9046 19528 bytes
SHA-256: 1b346556c7df455cb9a54b8f1a6e3f1a0bfffa2d9228fa0640c35d2bdb9db684

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