Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28317ab6568e5ec…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 06:54:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 18e0b71409fc37587361bcf4b467a10f SHA-1: 3c2c4aa46b2ef30bbe61ade990b1f6e8ecc2eb70 SHA-256: a28317ab6568e5eccfae193eaee372aad4eb0e0c8b9593a29733ed7aed572b25
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free coins'. The primary redirector URL is https://netcdn.online/app/406889139/coin-master-free-coins-and-spins-today-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a lure designed to lead users to potentially harmful content 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.online/app/406889139/coin-master-free-coins-and-spins-today-game-hack In PDF document text
    • https://purihostel.com/assets/CKImages/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-real_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
stream_004_off00005129.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5129 26408 bytes
SHA-256: 1bfb15122ba2fb3407aef0e351bcdd28250c764265bdd26b7313b6fa344fbc54
font_01_sfnt_off00008bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB6 18240 bytes
SHA-256: 4e9460ee7c922f2330eb91d2df2ab210a384988491c8b06196f83513902e5b38

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