Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b5c68b8423c7b…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 03:53:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 22537350567c4dd242f057cd01993ec7 SHA-1: dae84a1c5d388d23ff253dfc090b946324723da2 SHA-256: df9b5c68b8423c7b11ef70efb3c606f3b2cb36ff37b1768db65ee8c3babc1f77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to these lures and the primary malicious URL. The presence of embedded URLs and the ML classifier's strong positive prediction indicate a high likelihood of malicious intent, likely to lead the user to a phishing or malware download site.

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.online/app/431946152/roblox-executor-free-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.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_off0000504f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504F 25880 bytes
SHA-256: 9b4220c970a26c7d9f9cd431c512cdd0fe602a859abc9f9c41190ddb54a89188
font_01_sfnt_off00008ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA0 18192 bytes
SHA-256: ea871bc3cbe03b518fb751ba62897ebdd4c1203063e0cc28c04b209086b68926

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