Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa90951229612104…

MALICIOUS

PDF

32.8 KB Created: 2021-06-20 12:57:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d084498748662b83cd8334b09e93d08e SHA-1: 17365fe1d028de55aa739d4cfcbdcc5fc780d418 SHA-256: aa90951229612104b281af2e647b9908ea79628935f8e7bbb73cff1a7624b273
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.co', which is identified as a malicious redirector. The document body text and heuristic firings indicate a lure for 'free Robux' or game hacks, suggesting the intent is to direct users to potentially malicious websites for phishing or malware distribution. No scripts were extracted from this sample, but the embedded URLs and the nature of the lure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.co/app/431946152/free-robux-email-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hacks-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/bloodborne-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-watch-ads_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-codes-site_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-face-roblox_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
font_00_sfnt_off00002970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2970 22296 bytes
SHA-256: 1cc2f799cfdcae2d8429cd16ecc6cf92642f3900a0e49532560b55b8e93db42f
font_01_sfnt_off00005b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4C 19168 bytes
SHA-256: 81949eb249f07ccd810bf8edd5050511f765df999cf9474702d31c0fa65b3228

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