Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f78cf48ca807a23…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 08:22:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5d3424e30284f1d571c9a212140a9a2b SHA-1: 0a47483fbc17f793b0598915391c6e69983529f7 SHA-256: 9f78cf48ca807a2367ca23fb2500fe7beab0a901337d9961cf07ce26a127bcc3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, masquerading as generators for free in-game items. The primary lure is a link to 'how-to-get-free-catalog-items-on-roblox-2021-game-hack', which is hosted on known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malicious content or downloads.

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/how-to-get-free-catalog-items-on-roblox-2021-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-roblox-jailbreak-money-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/get-free-robux-n-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-hack-no-human-verification-or-survey_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_off00005284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5284 24644 bytes
SHA-256: 439666fecab3a99f6f54063d913ed110b1ea6adf25f49ede2066b7197dcae56e
font_01_sfnt_off00008b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1B 19392 bytes
SHA-256: bcd883a572104c7ae40c4327f2f125bfbac3ce3e44741fdd5d60713fe0f43136

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