Malicious PDF — malware analysis report

Static analysis result for SHA-256 31917a9a3c630c8e…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 02:44:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b545e434a7ead14361b42d663c58b24e SHA-1: 33e06c0dfd5025535417463a8005ea454fcae908 SHA-256: 31917a9a3c630c8ee9a702873ddd1844df2deb1ada2b640b9bc0201e71443b1d
200 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as a lure for free game currency or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of brand impersonation (Microsoft) further supports a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive users to exploit or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-get-robux-for-free-xbox-one-game-hack.
  • 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.tw/app/431946152/how-to-get-robux-for-free-xbox-one-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/multiple-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pokemon-go-free-stuff_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-codes_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_off0000513a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513A 26760 bytes
SHA-256: c1ee7ed9fcec9397f824683e3427dc931d31da47a87389adce65f0837894bbc8
font_01_sfnt_off00008d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 18280 bytes
SHA-256: 4ab76c2d1b4479eeef8e9c8c7a38774356fd41fb56d42ce2f23cdbab9bbddf40

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