Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daaf84a044e041b…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 02:54:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7785fd485a70d5a74790ae6cd935f4a8 SHA-1: 358b7f17e402cd4add33bbc74b355b66513035c1 SHA-256: 1daaf84a044e041bb103c876f8110f7c1271f61d0f0cc11f27481ced2ee7d829
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a download button lure further supports a phishing or scam attempt. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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-hack-activegamer-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-often-pubg-uc-appointments_GM1330123889.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/how-to-hack-coin-master_GM406889139.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_off000030b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30B0 21996 bytes
SHA-256: 38765200c864da5b98f907b4291fdd49ce2956c2511611296ea2a6601ed834ec
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 18376 bytes
SHA-256: 9071112516a3c1a751db78ff2cf185d6a5c8a1d73babf85370e027775254c109

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