Malicious PDF — malware analysis report

Static analysis result for SHA-256 1318107312fdf40f…

MALICIOUS

PDF

49.1 KB Created: 2021-06-08 21:16:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f199d348569495cd1f22158556474191 SHA-1: 1d55a6793b6c3257b7f795d13e8022f0958f8f72 SHA-256: 1318107312fdf40fde4e5db549ce7b34e50fbe02520969f305dc9ff5ec54ba49
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as offers for free game currency or hacks. The document body and embedded links strongly suggest a lure to a scam website. While no scripts were explicitly extracted, the PDF structure and the nature of the links indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-get-free-robux-hack-on-android-game-hack In PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-roblox-outfits-boys_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/pubg-uc-seller_GM1330123889.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/block-best-robux_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-cheats-crash_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_004_off000051d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D6 28244 bytes
SHA-256: aa120a0fdd3aa99fed1afbbec9c3baa4fe83302e5a46fda3f4ae36f945d86958
font_01_sfnt_off00009191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B40 18972 bytes
SHA-256: a9b0c601ff72aa6d025444f497f557741cc3f42f2f0f6bbe375e221e6bbe5b4f

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