Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4083a6497b1a83b…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 10:16:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b139f7a9cc61d4fd6c3517ec6cb1b03a SHA-1: 395ad769c09620d1b7fa557af648c7bee02b9555 SHA-256: b4083a6497b1a83bb24716a1705d48ccb803019021ad9795c6e8b1ec6668f441
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' or 'free generators'. The primary lure URL is https://netcdn.tw/app/431946152/how-to-hack-any-roblox-account-with-inspect-game-hack, which likely leads to a further download or exploit. The document body and embedded links strongly suggest a social engineering tactic to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-hack-any-roblox-account-with-inspect-game-hack In PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-gift-card-codes-unused-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-phantom-forces-free-money_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-robux-without-paying-any-money_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-cheat-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-wild-savannah-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-strucid-hacks-pastebin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/noclip-hack-roblox-jailbreak-may2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/pastebin-roblox-hack-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/www-roblox-com-robux-free-download-no-surveys_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/minecraft-online-free-no-download_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_004_off00005367.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5367 24248 bytes
SHA-256: baba6c255a6032b721030f5d11144500fc589f1215273644b8e5ed1ec5c67e75
font_01_sfnt_off00008a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A99 19432 bytes
SHA-256: 6f7157de6801e41dd9b4e281024dba4605ffaa139c806e2f44ec331b3e1e9164

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