Malicious PDF — malware analysis report

Static analysis result for SHA-256 b835a3c0595459a4…

MALICIOUS

PDF

42.8 KB Created: 2021-04-27 22:50:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f84aa356b27ba81bb813bebfbd7e1a00 SHA-1: 27ca9b7131e6d83cc3ba2937787a4ad4aad54a6b SHA-256: b835a3c0595459a409c26fc2c345affa08bff2f49341ca80bc4cffa0112318da
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, one of which is identified as a malicious redirector infrastructure. The document body and heuristics suggest a lure related to game hacks and free currency, aiming to entice users to click these links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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.xyz/app/431946152/teleport-roblox-hack-game-hack In PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-money-com.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-generator-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-robux-working.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-free-robux-proof.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/guava-juice-robux-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-roblox-bloxburg-for-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-lua-executor-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-virtual-piano-hack.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-do-you-get-free-robux-on-roblox-2021.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/again-here-for-free-robux-on-roblox-com-free4mobile24-com.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003ed2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3ED2 24756 bytes
SHA-256: 3bb7d13e67e506a9cc382e8191c773dc5857e4391bab3898578193be71eeb7af
font_01_sfnt_off000077c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000846a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846A 18464 bytes
SHA-256: ed3ae2142567399e1db028977d70ed61fd378745ba60a0fdf5c3cf83a95fcb7b

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