Malicious PDF — malware analysis report

Static analysis result for SHA-256 982620a170dbb62f…

MALICIOUS

PDF

41.5 KB Created: 2021-05-13 12:05:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: acf3ac2996c2488f999d004b08ba2ad9 SHA-1: a65dd569f0a6fc0679d0fe2988b8d381c9b603d6 SHA-256: 982620a170dbb62f027d62641513d4eb54c8b62eed9c8f5c3234bb6c71be0905
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body and embedded links suggest a scam aimed at tricking users into visiting these malicious sites, likely to download further malware or engage in fraudulent activities. The presence of multiple redirector links and the ML classifier output strongly indicate malicious intent.

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/406889139/free-spin-coin-master-link-2021-game-hack In PDF document text
    • http://pisanie-nut.pl/images/moon-active_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off00004734.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4734 24384 bytes
SHA-256: e2a91d04a5645b5813c9c9d9f205c149ccf0c609034b921f966a495392a533ff
font_01_sfnt_off00007f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F11 18456 bytes
SHA-256: e9900cc34792e9e10189734f2c0a95be85fa7d2c8d6cb23872c5da80ce816735