Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b8a48a5b26f32…

MALICIOUS

PDF

34.5 KB Created: 2021-07-19 03:45:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d9232415d9222c856c08b9e45173bc2c SHA-1: 9604ea6bb167ca30b2f8c519e1b6ea95b4cb62ff SHA-256: 821b8a48a5b26f32bcfa1dd9c04b36f792fd658760221cf556e55464ddd22b93
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, masquerading as "free generators" or "game hacks" for popular applications. The primary lure is "Get Tiktok Followers Free" leading to http://netcdn.tw/app/835599320/get-tiktok-followers-free-game-hack. The document body and embedded links suggest a social engineering tactic to drive traffic to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.tw/app/835599320/get-tiktok-followers-free-game-hack In PDF document text
    • http://sfera-express.ru/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/minecraft-bedrock-edition-free_GM479516143.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_002_off00003209.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3209 23320 bytes
SHA-256: 8cc23944c6c01e1b3ae9a64880ffcacaaf8635e69a6923e3b98cb20fbc931361
font_01_sfnt_off000066a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A1 17692 bytes
SHA-256: 8cacd57cbae25f5163b35c5b464cf1f4e6be88960ce09657a88da3590579257c

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