Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef3a90491783c00…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 19:59:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 09c12c1e9436f49d705dc4c5f60cb2ef SHA-1: 6073f24f4b82257499038970cd9d08ba2e0dc46a SHA-256: 3ef3a90491783c0015ec7b3977949aabf150f36631e9a04193ce718b8182690c
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to 'free Robux' and game hacks to entice users. It contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-robux-fast-game-hack, which likely serves as a gateway to further malicious content or exploits. The ML classifier also strongly indicated maliciousness.

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/431946152/how-to-get-robux-fast-game-hack In PDF document text
    • http://katalog.stikesmukla.ac.id/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-exsotic-cdes-in-roblox-assain_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-top-battle-games-read-online-free_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-hack-2021-android-fast_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/hack-diamond-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/menu-hacks-kupkake-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-paintball-daxter33-cheats_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/114-hacks_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/2021-free-robux-hacks_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-cheating-sex_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-go-to-robux-gg-free_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-spins-coin-master-2021-no-verification_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
font_00_sfnt_off00003076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3076 22976 bytes
SHA-256: 9be1e15ea25ac1397a5472b415788c5773251caf6d345d84e78e99e241baf5eb
font_01_sfnt_off000063c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C0 18984 bytes
SHA-256: 8f7f7d5cf2de43eb6e8e879c9f9a169600b9b4f474cc1f6a18409bcba38a170a

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