Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a68fe67b9d32cd…

MALICIOUS

PDF

44.8 KB Created: 2021-05-12 14:02:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 83c4d312394e08ae2c23f94505085c35 SHA-1: 9e6627946756a65872f892d70a17fa9e6deb3ae0 SHA-256: 28a68fe67b9d32cd3676383cca54025c8868698c053d7dae88497ff5abe0a6e5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and generators. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 3

  • 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.
  • 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/431946152/roblox-source-game-hack In PDF document text
    • http://pianoservice.com.ua/images/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/hack-coin-master-game-download_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5C 25748 bytes
SHA-256: 3742111453d85fa3d27b8d288fe6e62d03292759c5fc03494df4fb47de18bd14
font_01_sfnt_off00008820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8820 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9532 17924 bytes
SHA-256: de701b1390df5ea6859c32be6292d3183886ea3a2a613b5f80b12093d50b4b47

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