Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff52b6ce1f0616…

MALICIOUS

PDF

34.7 KB Created: 2021-07-02 08:44:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2ac1e2de822bcabf160c678b52ed9daa SHA-1: f5797462061fb2c3abfaae102bda715d6f1464d3 SHA-256: 42ff52b6ce1f06167982718c1aab0a0af6fad09830296f2b333038cc5ae50b04
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains lures for free Robux and game hacks, directing users to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body contains multiple links to potentially malicious PDF files hosted on vireco.store. No scripts were extracted from this sample, but the embedded links and redirector infrastructure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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/live-stream-free-robux-game-hack In PDF document text
    • https://vireco.store/ckfinder/userfiles/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-hacks-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-unlimited-robux-indigojoe_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-case-clciker-hack_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/roblox-has-talent-piano-hack_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/free-roblox-card-codes-july-2021_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/legit-robux-free_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/instant-robux_GM431946152.pdfIn PDF document text
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304E 22208 bytes
SHA-256: bdc30e301f487154543375a5341108b0b67c87d42258323f09db4b5b16ff12f9
font_01_sfnt_off000061aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 19316 bytes
SHA-256: 1309d72ceee9700568a1865c52ae737a702603645177e6260fde035d56fb335b

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