Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8d7424deaab1ce…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 08:35:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ab793ba694c21adc31fba68430599733 SHA-1: e4e68a706c4e69df9972f7efa08a33ec1039965a SHA-256: fd8d7424deaab1ceaf252f11bc1f34af6183b138384e869417b55b3727242e4a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a specific URL. This URL is also listed as an embedded URL and is the primary indicator of malicious intent. The document body, though partially corrupted, contains text related to 'Free Robux Promo Codes' and the same URL, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/free-robux-promo-codes-august-2021-game-hack In PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/https-webrobloxcom-catalog-202163-hair-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/wie-kann-man-hacken-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-on-a-computer-safely_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-in-roblox-2021-may_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/fgroup-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-code-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-roblox-toy-codes-not-used_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_004_off0000518e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518E 24872 bytes
SHA-256: f00863aa51e4f2414c5847b7c83ab724dfc36ec8c5a4e02bbed7f8610e2b1d9a
font_01_sfnt_off00008aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAA 19396 bytes
SHA-256: 9190588a5995af5fedc6627a7a93419a3d2d04a9007a29e5ea70aa512941e0ef

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