Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5a45dd83cb099c…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 11:37:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4c75651d3f681c46b12aeade24e570f2 SHA-1: c8f5fc14848e8a27f14557e83880c88512569fe4 SHA-256: 2a5a45dd83cb099ca03bbe6cf4e1728adb038d34f0e63d92cb6bc5666268051f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/100-free-coin-master-spins-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, designed to trick users into clicking the malicious link. No scripts were extracted, but the overall pattern suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/100-free-coin-master-spins-game-hack In PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/new-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-headphones-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-without-human-verification-and-no-sureys-or-downloads_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-free-exploit-dex_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-find-out-who-hacked-you-on-roblox_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_002_off0000300b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x300B 22652 bytes
SHA-256: 4fa0f07dd4afb85c09a99fe20d40604fda94880a0eaa0f09468bf0a2534dc683
font_01_sfnt_off0000627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 18452 bytes
SHA-256: 707739985df39afd660eea59fce54b8e542272332a8fd4aad1d1100e7e0fc553

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