Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e4224337ebd78…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 03:32:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f25855177e39bc8d7260f1332713931f SHA-1: 9e3ca04440aaff6d8211438293648fcdd616a550 SHA-256: 771e4224337ebd785ffe6e8eb7c8726bb082cf15cefe7be890ab777081697704
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free in-game currency. The primary URL, 'https://netcdn.xyz/app/479516143/how-to-hack-a-minecraft-server-and-make-yourself-op-game-hack', is associated with a game hack lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at redirecting users to potentially malicious 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/479516143/how-to-hack-a-minecraft-server-and-make-yourself-op-game-hack In PDF document text
    • https://yowchang.com/image/data/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://yowchang.com/image/data/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://yowchang.com/image/data/files/free-spins-for-coin-master_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_off00004aa2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA2 24556 bytes
SHA-256: 66a95fae6fe6ee931db0ccc68f470b503ecb64249030bb2fad3a08469b72beaa
font_01_sfnt_off0000820f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820F 18884 bytes
SHA-256: c6c75348c8512da505ae943a266b7446b2e14ebdee3fe9748eb8d749779a3ee4

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