Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5313288ba4d095…

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 07:21:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 507a1d22494f89014d433fa83e0a36df SHA-1: fef68f043a564acf55e5a52f373bf84088d1c06b SHA-256: 4f5313288ba4d095c35366c6bd9ed92b8d321bea721c0195c2782bb7ad55208a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains multiple embedded links that redirect to potentially malicious infrastructure, masquerading as "game hacks" and "free generators" to lure users. The "ClickFix" heuristic indicates the document likely instructs users to manually execute commands, bypassing standard macro security. While no scripts were directly extracted, the presence of malicious redirectors and social engineering lures strongly suggests the document's purpose is to facilitate the download and execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.xyz/app/479516143/is-minecraft-free-on-nintendo-switch-game-hack In PDF document text
    • http://atmos-service.com/images/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/robux-robux_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spins-and-free-coins_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_003_off00004b0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0B 26684 bytes
SHA-256: 5591716614543dddf30c01aa47a80ae5b160a1f96425881b354c8a935b756ba4
font_01_sfnt_off000085d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D6 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00008fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD3 18212 bytes
SHA-256: 88833f0f37aaf816a00c97530fc90e87f2df28a22611e5c00792867ae98cdb6c

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