Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf16d29871337a53…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 14:45:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f448a4b3db44b5920b777e0e22b1d52f SHA-1: 5d8a59f9a408849caf31b4ec3382ffac268389ff SHA-256: bf16d29871337a5389d1ca55d36165c5ae3b923298806395f52a98e727df9339
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a "free generator / game hack" lure. The document body and embedded URLs strongly suggest a social engineering attempt to drive traffic to potentially malicious websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/431946152/rbxoffers-earn-free-robux-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pubg-uc-pakistan_GM1330123889.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pubg-uc-official-price_GM1330123889.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-sites-that-work_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_004_off00005233.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5233 25428 bytes
SHA-256: fc4f56103211d3bcfcd173b0e6d92bb822074295ea69b3597ee568f8c5f6bb99
font_01_sfnt_off00008c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 18244 bytes
SHA-256: fa7b58e8bbd6048af1f0a6b5440a1dcdf7c9ae2c9f232fd911927377916bfdb1

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