Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a46ead766db0cf…

MALICIOUS

PDF

33.6 KB Created: 2021-07-03 22:43:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6c7af8f0c00178b41b496532fcbeea30 SHA-1: 057a42b56766b1b2fbe5312c32ac25b3d52bf25e SHA-256: e8a46ead766db0cfa2921e090d08a6d62aa397aba4986f06c38d04d7ca9c21db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-bobux-game-hack. This URL is presented as a lure for free in-game currency or hacks, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-bobux-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-xbox-skin-for-pc-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/cheat-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-roblox-accounts-walang-pin_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-have-free-skin-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-scarf-free_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/nike-roblox-shirt-free_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-robux-2021-working_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/cheat-enginge-how-to-make-roblox-not-crash_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-roblox-pastebin-com_GM431946152.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_off00002e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4F 22072 bytes
SHA-256: 01c5ca3eccc5dca0e637b7b2078cb89adc5b998cf2f6029869dee201431b23c4
font_01_sfnt_off00005f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 18716 bytes
SHA-256: f976c569ff7cb7122bba9c4de2e031be5f96ad73932d9d773f779cd6b83e63e2

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