Malicious PDF — malware analysis report

Static analysis result for SHA-256 638183b6fb522aea…

MALICIOUS

PDF

50.4 KB Created: 2021-06-03 09:31:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bba96671a2e330b8439c9437d02bae1d SHA-1: c7e34d608c12e04a608790c0db876e1783ee70b3 SHA-256: 638183b6fb522aeaad39147520f85665dfc24cef21ff7e2e1cef24ea6316da2e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a "free robux game hack" lure. The presence of a visual download button further supports a social engineering attempt to trick the user into clicking the malicious link. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/flame-gg-free-robux-game-hack In PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/pokemon-go-no-free-raid-pass_GM1094591345.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-fun-com-free-robux_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000537f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537F 27196 bytes
SHA-256: a0818ac67e3b0acf3ab8575a8d43a550e6c8216b13a75ed21c6cf533afb9891f
font_01_sfnt_off00009089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9089 4660 bytes
SHA-256: b8980cdac4d025496d9fe039d8c05bb5b9bae1b804244a1f9c05e9663db72816
font_02_sfnt_off0000a09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09A 18864 bytes
SHA-256: a12d67d537c0c2cb89f37f7f05ea7de5b6c0986bd532439e1b20da8093887b01

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