Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbb19d80102edb4…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 06:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d147387f57596c005d2063093b39e2d2 SHA-1: 558f94be67cf2cfef325666b1a9466a4a111f0cf SHA-256: 1fbb19d80102edb4e9f010a65150fb1192beb265b11625186ede8a425908c569
200 Risk Score

Malware Insights

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

The PDF contains multiple links, including one to a known malicious redirector infrastructure at 'https://netcdn.online/app/479516143/minecraft-java-free-account-game-hack'. This link is presented as a lure for a 'free generator / game hack' and impersonates the Apple brand, indicating a credential phishing or malware distribution attempt. The presence of multiple redirector links and the ML classifier's high confidence score support this assessment.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/479516143/minecraft-java-free-account-game-hack.
  • 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.online/app/479516143/minecraft-java-free-account-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/new-btools-hack-roblox-9-5-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coins-and-spins-coin-master_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
stream_004_off00005202.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5202 25520 bytes
SHA-256: ede12d25191d0a63bee96f36d24ed400c9426f89ee214c96d201dfa78b423eeb
font_01_sfnt_off00008bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC5 18128 bytes
SHA-256: 787ae5aa2fe8ee3e05b40f55ac2adb21d77115e18bda7782f632936ac93a1380

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