Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e116e1d35fda3…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 22:11:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 98d24917d52fcdeb208b3dba8f7349ce SHA-1: 5aecf782225ce1693efba0c63a73f1e3f67170d2 SHA-256: 9c3e116e1d35fda3e05da5ab9c5530981d5ccfa475c8a2eca1c64045282f4a74
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free spins' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-instagram-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at redirecting users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-link-today-instagram-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/dolphin-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/pubg-uc-zarah_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-code-2021-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-ou_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-anybody-in-roblox_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_002_off00003258.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3258 22972 bytes
SHA-256: 34b86c2457f74f4261c2db4677d1158e4959d717c3f0b29b90ce546e0adcdb51
font_01_sfnt_off00006638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6638 18960 bytes
SHA-256: 2b57405de0e85949a44aff108cdf7d94a29b82b397c72f5efb5695bba03a492e

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