Malicious PDF — malware analysis report

Static analysis result for SHA-256 f170c632d6e35f3f…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 17:37:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 100c37967715c020b5e7bded752d428c SHA-1: bc76821d7e35c260acaaaf2b10f7dde730ef0a56 SHA-256: f170c632d6e35f3f18b4ad1c77d6197f274df215b8fada38ccafe84748f58739
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a game hack or generator. One of these links, https://netcdn.tw/app/431946152/roblox-bloxburg-for-free-game-hack, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and generators, reinforcing the lure. No scripts were extracted, but the presence of malicious links and the lure pattern strongly suggest a phishing or scam attempt.

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.tw/app/431946152/roblox-bloxburg-for-free-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-speed-hack-on-roblox-sword-fighting-tournament_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-for-roblox-jailbreak-noclip-18_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hire-someone-to-hack-a-roblox-account_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_off00004e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E01 26888 bytes
SHA-256: eebf146a2db6d20716e18adda8a00c973881510ff0b2b6a926a5f7234b0b343f
font_01_sfnt_off00008be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE3 18376 bytes
SHA-256: 979d6e9656706d85a95741af03a873f41ab42d257dd3bae94f920df72a6f6b42

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