Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f87909051d1a0dc…

MALICIOUS

PDF

48.6 KB Created: 2021-06-03 12:22:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3797dfcccab95fcefc88688c964d15ad SHA-1: 5466fd08fdb0b12985941b3d13c76576aa1e1588 SHA-256: 4f87909051d1a0dc6d3c214d1b31b53641a2921e2e60d119d09507cee517d803
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' and game hacks. The primary link directs to a URL associated with a free generator scam. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack designed to lead users to malicious websites.

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.online/app/431946152/free-robux-websites-that-work-game-hack In PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/gain-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/tiktok-free-view-editor_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-quiz_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_off00005144.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5144 27300 bytes
SHA-256: 346c5cb8a6c8efee688c5976b10952dd7d1a1f0151dba7d5cabce9616d7d1246
font_01_sfnt_off00008e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E73 3040 bytes
SHA-256: 75eb4fc89f79501034adc280ddb40558adf2821f5b3f52cae58da647ffac6e3f
font_02_sfnt_off00009903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9903 19000 bytes
SHA-256: 7385cf8e30761df55e83d9792ae8d47179260988159899b0069d718a962ca50a

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