Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c85cb856f0425de…

MALICIOUS

PDF

38.7 KB Created: 2021-05-25 09:30:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9bf6a80c371b9f85e9a4db2dc777deff SHA-1: 8718b78ce688e410029868c5b41100a663ade77b SHA-256: 4c85cb856f0425de0469b5e627d589ce03ad4556c63175f39bf476e0810a02b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for platforms like TikTok and Roblox. The document body explicitly mentions "How To Get Free Tiktok Followers Without Human Verification" and includes a "CLICK HERE TO ACCESS TIKTOK GENERATOR" call to action, reinforcing the lure. The embedded URLs and the heuristic firings strongly indicate a social engineering attack aimed at redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.xyz/app/835599320/how-to-get-free-tiktok-followers-without-human-verification-game-hack In PDF document text
    • http://www.domkiletniskowe-wladyslawowo.pl/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://www.domkiletniskowe-wladyslawowo.pl/images/free-robux_GM431946152.pdfIn PDF document text
    • http://www.domkiletniskowe-wladyslawowo.pl/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.domkiletniskowe-wladyslawowo.pl/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://www.domkiletniskowe-wladyslawowo.pl/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000316a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316A 24704 bytes
SHA-256: d8b743267348c5d8e61820e559bfe1c9b35f8b1083400d79e6be642b9725cb16
font_01_sfnt_off00006a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8C 2892 bytes
SHA-256: 5e0712ca08337fb3b2e5736ec787a8b2ab1b9b6f3706f0b029d23afe08e6a7a6
font_02_sfnt_off00007472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7472 18820 bytes
SHA-256: 79c2bf02bc82707ab9f25b25786afb4a3e11e0d45a314ed7c066e7684dd6d9fe

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