Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a15fc291a1e740…

MALICIOUS

PDF

37.0 KB Created: 2021-07-07 23:43:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6485d53b1ed62b375918b7fd5ef8a594 SHA-1: 066b4660a9d369258ed24a4250dd571aef7a5e25 SHA-256: 53a15fc291a1e7407d44fa7f7acdbecc9837142ae395e1d9d6e8c1d0ee73acfb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "cheats" for popular games. The primary lure is a link to a "Coin Master Cheat Apk Free Download" which resolves to a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into downloading potentially unwanted or malicious software. The ML classifier also flagged this PDF with high confidence.

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-cheat-apk-free-download-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-executor-roblox-asshurt_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/simple-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-a-group-on-roblox-to-own-it_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3823 23028 bytes
SHA-256: d344b54a2fe8e70ca64a130fe8c0a9a5f8a37dfa9c7da3e2c18151278906761a
font_01_sfnt_off00006be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 19092 bytes
SHA-256: 49edf52c5cf368a8d41ab1b9b283a900cdd060b2dfdd3a58fc5bfb308b9a1ed9

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