Malicious PDF — malware analysis report

Static analysis result for SHA-256 357328db1618aef3…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 10:00:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 769fa32c299737096d5feda17f7a294e SHA-1: 0f92ec242a98afc3beb0706deb2446f06a367980 SHA-256: 357328db1618aef310fadaa3e85cdd4f6ce348ade1b547f519e4378d4189ec21
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and free account generators. It also presents a fake CAPTCHA to trick users into further interaction. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-roblox-accounts-not-banned-game-hack, which is likely used to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-roblox-accounts-not-banned-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-do-roblox-points-do_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
font_00_sfnt_off00005122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5122 24416 bytes
SHA-256: f4145eabeeb2cfe6efd660379f27b71cfd7fc83ca5ea0e1a6099f61297c445d2
font_01_sfnt_off00008947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8947 18592 bytes
SHA-256: fc6f134a9a4d708c829459ae097e382493fdcbb28c1a74245617ce3e157d1c66

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