Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ffe918099f1336…

MALICIOUS

PDF

41.4 KB Created: 2021-05-16 15:47:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 822f10e4af3f23418e369697a1713d45 SHA-1: db4f32f12391c1bd60a91c69a243079d68e8a892 SHA-256: e9ffe918099f13362a82e02339300753c17a6d7c308502dbc3a2878441828aac
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users with promises of free game currency or hacks, redirecting them to malicious infrastructure. The primary redirector URL is https://netcdn.xyz/app/406889139/cm-free-spins-game-hack, and the document also hosts a large number of SEO-optimized PDF links on http://mountain.mn. These tactics are commonly used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/cm-free-spins-game-hack In PDF document text
    • http://mountain.mn/uploads/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/wurst-115_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-daily-free-cards_GM406889139.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_003_off00004a56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A56 24276 bytes
SHA-256: 52adb97d6da15679e057154728b3afc85f8186929ab92e0d5418958efd381234
font_01_sfnt_off0000816f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x816F 17672 bytes
SHA-256: c7edaacf3d8891068ee17a427980e4b8712b9880538c2e482dce739b11255869

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