Malicious PDF — malware analysis report

Static analysis result for SHA-256 2237d14056dd6e9f…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 06:51:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 625c4834d2d79b49e31d7a9c121afdd7 SHA-1: 65350f73c1a43f088c9e916d098890a317e22753 SHA-256: 2237d14056dd6e9f0f95605da8c4abe8900ac1d904159586c854c5f123887064
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a "free generator / game hack" which links to known malicious redirector infrastructure. The document body and embedded URLs suggest a scam designed to trick users into visiting potentially harmful websites. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/479516143/how-to-get-minecraft-for-free-on-xbox-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/tiktok-free-robux_GM835599320.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/pubg-uc-jarir_GM1330123889.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-coins-spins_GM406889139.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_004_off000054c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54C1 25528 bytes
SHA-256: dd2a77c5d7fdc9641e10fb66eca41e1994ea1ac8e1a4f447d12bbfba02e2b1b9
font_01_sfnt_off00008ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC6 3056 bytes
SHA-256: dd24a0ab94df4552e459bd06fd01b0fd3f021c1d51d1d64407070e735974a028
font_02_sfnt_off00009939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9939 18472 bytes
SHA-256: 63446f7755945d37ec8b97d22fda434cb08cbf4c61a02f7f94d2af605f03b611

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