Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a4613a0e919b5…

MALICIOUS

PDF

45.7 KB Created: 2021-06-10 23:22:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b307baebdbfce5ef0363e74b6d15e323 SHA-1: fa0c94d011b847120d7017e4ff1c011460b29938 SHA-256: 5f9a4613a0e919b53a09f47f0f2e44ae7d9e52ecdebea78010757419a235ca5b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game items, indicating a phishing or scam attempt. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-get-free-outrageous-and-robux-earrapr-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/how-to-get-free-outrageous-and-robux-earrapr-game-hack In PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-source_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/pokemon-go-free-trainer-codes_GM1094591345.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/spin-link_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-2021-not-patched-read-desc_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hacks-for-gold-cards_GM406889139.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_004_off00005140.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5140 25956 bytes
SHA-256: 14def98c5ba25ebad7a489215753cb0ef895135299d766d468a6fe1bc96a591f
font_01_sfnt_off00008d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1C 19148 bytes
SHA-256: 675162b1e0146f5fc54cefcd5b2be9b2ace7695864d8316003ba716fb71dd6f4

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