Malicious PDF — malware analysis report

Static analysis result for SHA-256 9286fac1bee20950…

MALICIOUS

PDF

43.8 KB Created: 2021-06-04 03:23:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bc4367ae30f20ff826e3ed52362a6835 SHA-1: 69d4cf20d835d74b98256dfb15e2b5bdfe9ae0c9 SHA-256: 9286fac1bee209501b87d8e615a81ad889866a1855fc418da4a04ab9dba7e9d4
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, impersonating Facebook and promising free Roblox items. This lure is designed to trick users into clicking the embedded URL, which leads to the malicious domain netcdn.online. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the overall pattern suggests a credential phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-roblox-clothes-boy-game-hack.
  • 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.online/app/431946152/free-roblox-clothes-boy-game-hack In PDF document text
    • https://library.kysm.edu.my/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/robux-free-gift-card-org-hack_GM431946152.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
stream_004_off00005065.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5065 24212 bytes
SHA-256: cf99b0ffe640797160b26e970c7af5be74ce2009bb78f1de05e7bb00d6a855af
font_01_sfnt_off00008801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8801 18400 bytes
SHA-256: ff0928d05cd2328f5f6db263fee94a7b5023d77c4cae175890f1311eb4a8d902

Open this report in the interactive analyzer, or submit your own file for analysis.