Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bba0a36dfc0e8d…

MALICIOUS

PDF

43.6 KB Created: 2021-05-13 10:02:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 47b40d5bb638dd75759db1633bdc36f4 SHA-1: addfe45269654935b4f81984c77310802a04b935 SHA-256: 21bba0a36dfc0e8dafa401bd313c19d6ebbe5c24f10956944000562268c31f4a
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 free Robux or game hacks. The heuristic firings indicate that the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/bloxawards-com-earn-free-robux-game-hack In PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-scam_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coin-master-spins-daily_GM406889139.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_off00004baa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAA 26564 bytes
SHA-256: debe7ddf0bc1a99766c8c20186ad9a72f9ced30de7e5b6090a10982d1138f433
font_01_sfnt_off0000866b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866B 18916 bytes
SHA-256: ad6cfd8b97476ff22bd965746e6d59def3dc1c42c07a754b956efad1c533161c

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