Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aca6891319d658…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 22:14:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e6cac51b1408affe7f8f40cb86ea2e6f SHA-1: 2006763b74cd211b91bd8fc2e520b8169e3947db SHA-256: 42aca6891319d658d21e51dfeea97cf08348cf54472760c06407d6ebae141874
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links to known malicious redirectors, masquerading as "free generator / game hack" lures. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The presence of a password protection lure suggests an attempt to bypass security controls by encrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://netcdn.online/app/406889139/free-spins-coins-coin-master-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-tiktok-followers-and-likes-no-human-verification_GM835599320.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-pet-food-coin-master_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_off00005233.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5233 24752 bytes
SHA-256: 4be4441df40ced6230158e0bf15683b3e3ee0adefa4e9869a7f9ea5bb40f4ebf
font_01_sfnt_off00008a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 3380 bytes
SHA-256: cb8371cc187c45116d0984119c2893dd3db0d7f7d568d007a419406e6ca9f389
font_02_sfnt_off00009662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9662 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6

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