Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16b53809438e853…

MALICIOUS

PDF

47.5 KB Created: 2021-06-08 12:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: da048b8fbf632b914b26880f94448543 SHA-1: 78cc17147a08439d8019641d181d4bdd3f84b1b6 SHA-256: b16b53809438e85326bf63f236b5d6128b43a0ec49ee9a30a7dc9c59108742f6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' for popular games like Roblox and Minecraft. The document body and embedded URLs strongly suggest a lure to trick users into visiting malicious websites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/roblox-hack-2021-no-verification-game-hack In PDF document text
    • http://umksn.pl/images/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/roblox-hacker-song_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-make-the-animation-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-make-stuff-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-free-soins_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0B 25432 bytes
SHA-256: 35eb344cdbbf7dfeacad750ac9465444cc501e359301ebdbfcfe5648dd6f2d51
font_01_sfnt_off00008800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000094a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A8 18944 bytes
SHA-256: 2e5b8ddd60bd6cadda2838e35aa0dbaf3ba9f74a10469589ea76ddb22b686ee8

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