Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4adfa8cada5b4b2…

MALICIOUS

PDF

45.1 KB Created: 2021-06-04 03:53:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b9e5e2ac452b9d4f01152a9e0b53a335 SHA-1: 5c3e303bf8d100b26311ab8a31bd3c47f800412c SHA-256: d4adfa8cada5b4b2e9782a08496ad2f2f5ee9f9fcdf315ab4a4e0c8710b16cc9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them, leading to known malicious redirectors and potentially unwanted content. The document body and heuristics indicate a scam related to 'free Robux' and 'game hacks', aiming to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a redirection workflow typical of phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/free-robux-games-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pubg-5-uc-buy_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-no-scam_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_off00005312.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5312 25364 bytes
SHA-256: c5ead53c1ceba99803ad842ab68a1b9707e2de82b1fb33ea7795ca2bf8eb5c5a
font_01_sfnt_off00008d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D36 18500 bytes
SHA-256: 50954281d46d1092d2c36c5fba9e04257001c8c7e5b0c8732206987489559ecb

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