Malicious PDF — malware analysis report

Static analysis result for SHA-256 281495321b862e4c…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 13:41:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 606ef06f639f5b381cdf1b17725fa712 SHA-1: beb66476063fe9441c0fcff9d4368636ace701fa SHA-256: 281495321b862e4caf01d6a5239bb061e23969ba98d8a8cbd4a18a6f8279fa51
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that advertise free game generators, hacks, and in-game currency, indicating a lure for users to download potentially malicious content. The presence of a known malicious redirector URL and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the document's structure and embedded URLs suggest it is designed to facilitate the download of second-stage malware.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/coin-master-free-download-app-game-hack In PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/pokemon-go-free-bonus-box_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustaIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004db4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB4 27764 bytes
SHA-256: 0e61eae5cede18914a1c9630c8bfa596a6d66ff7dc4bf0816b9fb76a7f327897
font_01_sfnt_off00008a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A74 18464 bytes
SHA-256: 707f6cdc96ab39b500be18419555e7a9cc74e7164cf2d3c35a5692c5f811a1f3

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