Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13928bcff8f9de7…

MALICIOUS

PDF

42.8 KB Created: 2021-05-15 15:39:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22888cadf1f67d6430527df6ab6d1f4f SHA-1: e9092b4bb3387cd8f6b398288e0340d9c86daeca SHA-256: f13928bcff8f9de77996c2e0c9d860fb36eea23a57c6352e42dfeef1bf126c9c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically promoting 'free Robux' or game hacks. The document body and heuristics confirm the intent to lure users to the URL https://netcdn.xyz/app/431946152/rbx-gg-free-robux-game-hack. This likely serves as a phishing or scam attempt to compromise user accounts or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/rbx-gg-free-robux-game-hack In PDF document text
    • http://www.comitatoiseo.org/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.comitatoiseo.org/images/coin-master-hack-apk-35-11_GM406889139.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_003_off0000480b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480B 27104 bytes
SHA-256: 693e5304c32094370ec0767f16581260b1f55a8c8115fc78249301bc8b08d2e1
font_01_sfnt_off000084f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F2 18304 bytes
SHA-256: d1ad45f5b083d36c6ec4c124be04f92537ae8dd31535970cb7662339535ad89d

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