Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bec057334d311ac…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 11:33:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0db915b9bfc3b72bf64639d1bcf5233f SHA-1: acb7ed8c010ed004fd9c79ca478f479fa9bf4c13 SHA-256: 0bec057334d311aca1da68137823fe9c122a883cc82f4cd716f7e6badb1b3029
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically advertising "free generator / game hack" content to lure victims. The ML classifier strongly indicates maliciousness. The document body and embedded links suggest a phishing or scam attempt designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/master-8-ball-pool-free-coins-game-hack In PDF document text
    • http://dermatologos-thessaloniki.gr/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/wurst-112_GM479516143.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://dermatologos-thessaloniki.gr/images/how-do-you-earn-robux-on-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
stream_003_off00004a99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A99 24572 bytes
SHA-256: 49d0abc6915103696599e03375a481255d19e87ffd86aae5e89bd5c0c8452e43
font_01_sfnt_off0000822d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822D 18364 bytes
SHA-256: 6e0a537e63e8d7ae493ffba7f694c0e5cbb50b5e44b8f04c82ad864b2eef269a