Malicious PDF — malware analysis report

Static analysis result for SHA-256 1321d8f9f99003f1…

MALICIOUS

PDF

34.3 KB Created: 2021-07-01 11:08:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 966eb4cc3fe4ad3619191c0157a3ae34 SHA-1: e2426c910dfbc0dd95d51d2e4fd093d6bbea42e5 SHA-256: 1321d8f9f99003f1d35a28bb918a8e117242d6ccb7593a7b9142294c31e51587
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, masquerading as a 'free generator / game hack'. The document body explicitly mentions 'Free Robux Games' and includes the malicious URL, indicating a phishing or scam attempt. While no scripts were extracted, the presence of malicious links and the lure content strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-games-on-the-front-page-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-make-a-shirt-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-how-to-create-a-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-u-hack-people-account-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-woodland-money-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-not-scam_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-adminon-all-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-account-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-font-free-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/app-store-roblox-free_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
font_00_sfnt_off00002d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9A 22584 bytes
SHA-256: 9e0a9a56f3799d278355c242d81bf6887b64725a232e3b667868e4ab80458fca
font_01_sfnt_off0000604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 19400 bytes
SHA-256: cf46895b778b927357ef2eba4722e5ca534e5d52dac9a93b388e70972e2ad307