Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9fff1914f09011…

MALICIOUS

PDF

32.8 KB Created: 2021-07-05 20:23:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fbfd00aebf2d4734d976a5e87df8027d SHA-1: 5e6dd6a7fb63546d76e6597ab765a4c83596ee0d SHA-256: 5a9fff1914f0901153ab3a3551eb88506a97482a8d6a01440839840cf185713e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure, promising free game currency or hacks, to trick users into clicking embedded links. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-hack-apk-download-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a workflow designed to lead users to potentially malicious download sites or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/406889139/coin-master-free-spins-hack-apk-download-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/site-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-bloxburg-build-hacks_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pokemon-go-free-3-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-gift-card_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_001_off00002a38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A38 22384 bytes
SHA-256: b78f7c41d2a9e625165500cc83baf0076b6b024c2840436f4a2c9a26db7eb707
font_01_sfnt_off00005c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C07 18924 bytes
SHA-256: 5f265c6d24676a8426621fea6e3781f16e4a39cf4ab57530a0876d9f7c567a0a

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