Malicious PDF — malware analysis report

Static analysis result for SHA-256 a031e1e05d5504f5…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 13:56:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 26805675d44a951edeb1b8ec88f32300 SHA-1: 81090134bbd2a161183a93733a013cdfe6d3bb93 SHA-256: a031e1e05d5504f5e2c42173bc20d8cc0554249fcc2f108a2b3d821253f86b61
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector, disguised as a 'Coin Master Free Spins Save Game Hack'. The document body, though heavily obfuscated, contains references to the same malicious URL. The presence of these links and the lure suggest a phishing attempt to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/coin-master-free-spins-save-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-btools-hack-mac_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spins-link-march-2021_GM406889139.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_off00005011.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5011 24440 bytes
SHA-256: 0f27ae8bbc79239ecae2b52e51a95bd365d9eec0cfc1ae4e04d090cafa6bd21c
font_01_sfnt_off00008810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8810 3524 bytes
SHA-256: 5304a476faae656d26dcb3cf3a5ed1dff0de5131cd6604c1c72cf5ff7deef9ab
font_02_sfnt_off00009488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9488 18000 bytes
SHA-256: 15196760a456ceed464ee2468def3f91d90090408435a376e50e8e29bc25aeef

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