Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cfa16d5e1dae8e…

MALICIOUS

PDF

45.7 KB Created: 2021-05-14 10:06:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dcbaa9f0142506d99107ded3eb3288bc SHA-1: 29ee04f00eec8a64c43bf755d50a89e948b77283 SHA-256: a9cfa16d5e1dae8e52118b22ffc678ef03ecbfe68c0370ce2b88624d738f4e1a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites offering game hacks and currency, indicating a social engineering lure. The document body and embedded links suggest a phishing attempt to trick users into visiting malicious sites, likely for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/free-roblox-money-game-hack In PDF document text
    • https://globair.com.tw/image/data/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004974.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4974 26392 bytes
SHA-256: 7d42c6dd6e7d86b19d25f762fabe51a6fc091d6f170eca0c33b55c65bf220067
font_01_sfnt_off0000861f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861F 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCE 18324 bytes
SHA-256: 592c86f68d7cfce1f91e7ace661462f05e7807c87c96d21e42ea748452481f78

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