Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9efda137eebcd6…

MALICIOUS

PDF

42.4 KB Created: 2021-05-11 00:01:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9c32f7e52a27c3c9e697bb8342fc4baf SHA-1: 6d2609374aa42c7171a58ac30672a649fdc0d2ee SHA-256: ff9efda137eebcd683bab0c4e0dafe662f8636231b551f980c255dcc9a3b27e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for game hacks and free currency, which is a common social engineering tactic. It contains multiple embedded URLs that lead to known malicious redirector infrastructure, including the primary URL 'https://netcdn.xyz/app/431946152/oprewards-free-robux-game-hack'. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is designed to redirect users to potentially harmful sites.

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/431946152/oprewards-free-robux-game-hack In PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/best-minecraft-hacked-client-2021_GM479516143.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_off0000488a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488A 24780 bytes
SHA-256: eedd2e22a6ff8c0a81df0db717083004ad15557ef0774e2270798660ea88db6a
font_01_sfnt_off000081e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E1 18756 bytes
SHA-256: ea6a04d6c65882c9dd78ee7ca96c70e45062fdc6b69d68e2fcdc099d3abb6428

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