Malicious PDF — malware analysis report

Static analysis result for SHA-256 3805fb569f5c2310…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 15:31:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8a4b74f8668a87e431622d38ae863637 SHA-1: 670975f860646f4cb70bd6c270389b7935c4364a SHA-256: 3805fb569f5c231068a7aacc7718b02f73da1698d36dc72f52217ee4882db48d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'game hack' lure. The primary link, http://netcdn.tw/app/406889139/hack-spin-coin-master-2021-game-hack, is identified as malicious redirector infrastructure. The document's structure and content suggest an attempt to trick users into downloading or visiting a compromised site, likely leading to further malware or exploitation.

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/406889139/hack-spin-coin-master-2021-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/comment-cheater-sur-flach-ticoon-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pokemon-go-free-healing_GM1094591345.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-real-2021_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
stream_002_off000034fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34FB 22972 bytes
SHA-256: 623d722aa5a9870d56f0d816e4e0dd32ba988d3bd742bf77d584480764bf9a9e
font_01_sfnt_off00006872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6872 18580 bytes
SHA-256: 948825e8e0919a7d5b45c8ff39041a5b5db9eb6eedd7cf3e77156be0f32367af

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