Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d633a6adc9ad74…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 05:40:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a963698b0f327b2ac23050d47ab5c097 SHA-1: e5b42a327a19d1ec87de16c015a751cb902ef7af SHA-256: f2d633a6adc9ad74acbdacf0ce8f11c56e8c13bfb42b8f1b148ba9dab3ff6075
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to the same URL. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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/479516143/how-to-get-minecraft-bedrock-for-free-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/tiktok-free-trial_GM835599320.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-free-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_004_off0000529b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529B 24848 bytes
SHA-256: 3ccf61ce0c8bbcc8a26200f9614fd8fea63a537ece11fdcc772ba62946bab8e8
font_01_sfnt_off00008a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A92 18436 bytes
SHA-256: 052b3e4eb9e318375354f57606905a9f494055cf593924234d38117cd20d5d16

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