Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb1d5d738becad7…

MALICIOUS

PDF

33.4 KB Created: 2021-07-19 06:24:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9aa6b4ea7cb00a91b1b06986939d8190 SHA-1: 85543cf30b9b780aaa7e52b976207bc9ccfd8302 SHA-256: ddb1d5d738becad77a586fea3787c990f8dba75d7de7f79733a3071504d3b5cd
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The document body and embedded links suggest a lure to trick users into visiting these sites, which likely host further malicious content or phishing pages. No scripts were extracted, but the presence of multiple malicious links and the ML classifier output strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/how-to-get-free-tiktok-likes-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-hack-game_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_off00002ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC4 23036 bytes
SHA-256: fdb0a68a693d270eb6f140263bd07b784b4317a44c3ce1d41b552e8eb1e214cf
font_01_sfnt_off00006278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 17620 bytes
SHA-256: 741fb2b5b30d8c36687485fbf08913b92fc3b4be4da5bff93af7320c30ccb52b

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