Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dd3b1e1bc87bf4…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 08:51:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9bc554426e0a42a6c7ef1b534fe8c301 SHA-1: 3445f223a949cf6050652873f0918f31bc03db15 SHA-256: 44dd3b1e1bc87bf4455537b6f83775cff5de2df29956ca4434c86514e6039f68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting "game hacks" and "free generators" for popular games like Roblox. The primary lure URL is https://netcdn.tw/app/431946152/roblox-how-to-change-your-username-for-free-2021-game-hack, which is designed to trick users into clicking through to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-how-to-change-your-username-for-free-2021-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hacker-gamepass-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-cheats-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/tiktok-freein_GM835599320.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-apk-hack-mod-download_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_off00005029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5029 24808 bytes
SHA-256: d66850dee11387fe670a83fbf7c411b23e5d4240db3eb4c7b210dac10dfe64f2
font_01_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 19944 bytes
SHA-256: 37809f4013e3ff8af662d8ba09022c2f4b569e8e92da06d830a51510e5320434

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