Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f6d78442d32bc3…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 11:22:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9b1b8c583c20ac4eb38d788b516974d4 SHA-1: abbc35179ff820b1f4ac8ea864bcbd2c793d543f SHA-256: 73f6d78442d32bc34d93c410f7d8a1473c256d3b0ea68f6e8b5689c47829acfe
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to a known malicious domain, masquerading as a game hack generator. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to drive users to malicious content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/hack-coin-master-with-lucky-patcher-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/is-every-game-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.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_off000051c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C2 24012 bytes
SHA-256: 2c8773b24d98238c42152e9256715a7fd55ea4b4699894d6e392d3a6599075d1
font_01_sfnt_off00008881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8881 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off00009364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9364 18552 bytes
SHA-256: 2ef819c75b3a0e1f10814af5d5822ed8fdf4a5514fe4edddd3d35c731c38b399

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