Malicious PDF — malware analysis report

Static analysis result for SHA-256 f453b6f1dc7d1884…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 02:47:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 813d17d243e51d1d94632a9522413822 SHA-1: a94b84a65cc869c40b7be67711f2c12cf092c8b6 SHA-256: f453b6f1dc7d1884bd19cf951450d1c64b6a532bfb209a124d2434e4a2a90506
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links and a call-to-action phrase, directing users to a URL associated with malicious redirector infrastructure. The primary lure appears to be related to 'Coin Master' free spins, a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests an exploit is present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/406889139/coin-master-get-free-spins-game-hack In PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-hack-roblox-with-cheat-engine-66_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-hacks-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/fly-hacks-script-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-roblox-gsmes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/comment-avoir-des-robux-sans-payer-sans-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-straight-awayu-cheats-for-money-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/comment-hack-roblox-money-illimity_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/cheats-in-wolves-life-3-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/final-stand-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/cone-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-script-hack-rovive_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-get-tibetan-mastiff-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/fashion-frenzy-roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-roblox-animations_GM431946152.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_off0000325b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325B 23060 bytes
SHA-256: c768ffb1aae6688ab95046eafaf5062166f3d45d12b62c3579e9d9a873695765
font_01_sfnt_off00006659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6659 18176 bytes
SHA-256: 8a0bb7edf09d6f3952b48e3a2cbb563109f52edf17674e1c6eaebc594b7e7f44

Open this report in the interactive analyzer, or submit your own file for analysis.