Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99adfecc5f3036e…

MALICIOUS

PDF

33.4 KB Created: 2021-07-06 12:42:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3ac86332c07b26891ba52c9cda079491 SHA-1: 18d5f56e7159be938ad228e1d18eab255ed3a55a SHA-256: a99adfecc5f3036e5e65d71caa82d2a3ee30a0c9146ee4d38a7de8ed2b7f9d26
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, designed to lure users into clicking on deceptive content related to game hacks and free items. The primary redirector URL is http://netcdn.tw/app/406889139/instant-free-spins-coin-master-game-hack, which likely serves as a gateway to further malicious content or downloads. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.tw/app/406889139/instant-free-spins-coin-master-game-hack In PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-aimbot-cbro-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-millions-of-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/como-ser-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/hack-de-allah-akabar-roblox-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-bloxburg-building-hacks_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/inject-hack-roblox-com_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-gift-card-in-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-8-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/announcer-hack-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-admin-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_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
font_00_sfnt_off00002fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDE 21920 bytes
SHA-256: 38242b6ff2cfa175651b1c2bc76436eddf235128e99bcd757326935182d65c74
font_01_sfnt_off0000602f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 18176 bytes
SHA-256: c70a1f0c614cb30c37444bf3dc225d6e3fc5e4532f1fb822084366f15ec213db

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