Malicious PDF — malware analysis report

Static analysis result for SHA-256 21991e5f2da17974…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 13:57:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 300e247b91fd39b8e1403b4521828a67 SHA-1: c8df1f395fdab95ed4c2882737abd0699551ebe7 SHA-256: 21991e5f2da17974a06531ecb8e3f3def736e1c0b5955c7b2d70203e90dacaf8
160 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'free generator / game hack'. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that align with the heuristic findings, suggesting a lure for potentially unwanted software or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-gun-roblox-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2C 27192 bytes
SHA-256: 24f33863d619201382d7a996b7b8437bf359690893fa77216269ed44aafc1b25
font_01_sfnt_off00008c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C98 18088 bytes
SHA-256: c27c38b9193ad66fd6d2d935077c2c739c274c0fe094f10c77bbc7193b696125

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