Malicious PDF — malware analysis report

Static analysis result for SHA-256 24322ab353105dbd…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 11:30:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e69e4f52d1031d0edd763d72b347349f SHA-1: b6ca51b81e9fc74372362cd647818a608b7915f6 SHA-256: 24322ab353105dbd860f041ee44be48ba50ed537298bdc6a93fe1615d22ecc20
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector link, specifically luring users with the promise of game hacks and free generators. The embedded URL, https://netcdn.online/app/406889139/spin-coin-master-free-game-hack, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and mentions 'game hack' and 'free generator', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/406889139/spin-coin-master-free-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pubg-5-uc-buy_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000539f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539F 25760 bytes
SHA-256: 7791a7c6bc31e75f79f76117d1ba9c74e766d14b3a1b515c2a023467c314b13e
font_01_sfnt_off00008f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F52 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off00009cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDD 17884 bytes
SHA-256: 6361ede382a163d704ed6c8f102c2990305f9cba1a2540397fd15e2a8f655622

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