Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe51387ff3220aae…

MALICIOUS

PDF

45.9 KB Created: 2021-06-09 02:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 91b3bf457ee055a50515a16cbb00d611 SHA-1: aac6a061caa6a7271811705de1c3b915c44341f7 SHA-256: fe51387ff3220aae4b7224f057e7e3c01ea12117766b2467bd986e521c37548c
220 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are SEO-optimized PDF files hosted on domains associated with malicious redirectors. The primary lure appears to be 'game hacks' or 'generators', aiming to trick users into clicking through to potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a redirection chain designed to deliver a payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/comment-hacker-roblox-sans-logiciel-youtube-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/pokemon-go-free-pokeballs-no-human-verification_GM1094591345.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/earn-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-robux-for-free-instantly_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/pokemon-go-accounts-free-list-2021_GM1094591345.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

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
stream_004_off00005272.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5272 25760 bytes
SHA-256: 9fdae0d736abbd5c132674ade957b33964dfac447eeb6311e6439408095eb041
font_01_sfnt_off00008ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDD 19256 bytes
SHA-256: fa70bb18553e7f8d9428bc6ee840d465aa7ba88537a7311308aec6dd7d87c93d

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