Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c781bf24b82609…

MALICIOUS

PDF

41.3 KB Created: 2021-05-20 05:43:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e38f6d58ce0c18e3a7bf6a73819edac1 SHA-1: 086dd4422543261c3826af134c4fe313a6b1c4a4 SHA-256: 40c781bf24b8260923f386998a4489c807c3fe6b37eef1b8edfb9ccbf86b9af2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free spins, identified as a lure for malicious redirection. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-blogspot-links-game-hack In PDF document text
    • http://new-era.com.tw/image/data/files/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45EC 24996 bytes
SHA-256: c272b4e327c4899520eda18cc0a15051590658f219a6a7ecb9b900b5f4b5263d
font_01_sfnt_off00007e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E37 18472 bytes
SHA-256: 3a9541160e4b92d794687f49994e2eb1b208d5ca6227e81bc9e0881bb6ba4ccc

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