Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e12f00a6340a7f5…

MALICIOUS

PDF

35.8 KB Created: 2021-07-03 20:56:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 57c1da365910248f2de5cbaf7a309075 SHA-1: 08fc272f6cbd5c4fbdcbfe5505e1c87f4de58e82 SHA-256: 6e12f00a6340a7f58612de19a27f9583381062abc4e0457b1bbb2bfed3bad8ea
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to malicious redirectors and SEO spam pages, primarily offering 'free Robux' or game hacks. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-no-human-verification-and-no-survey-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/431946152/free-robux-no-human-verification-and-no-survey-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-bloxburg-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-bc-accounts-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/robux-hack-only-download_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-do-you-get-thengs-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/www-rbxmaniac-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-jailbreak-hack-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-gain-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-mining-simulator-hack-download_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-speed-hack-download-free_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-download-roblox-for-windows-7-32-bit_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/hack-roblox-arsenal_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-money-cheat-codes-rocitizens_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/urbexclub-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-jailbreak-cheat-engine-money-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdfIn 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_002_off000030db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DB 23020 bytes
SHA-256: 49c87032de46d696e3d29173465b391091cca53420a42a22776afe165c2201f7
font_01_sfnt_off000064c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C9 19800 bytes
SHA-256: fcd4d125090859beb8b270f882485097339e29693181c3776c14839bc9dcd643

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