Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a9798d2e8cff7…

MALICIOUS

PDF

43.1 KB Created: 2021-05-18 01:33:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c172355adafd4095187d5da1eb8c7643 SHA-1: 5db60f10727faccfe5d8ea816ac8dd84def90b64 SHA-256: 194a9798d2e8cff7dee0ed0a42ba80ba75bf1eb2bbfb105c1f7b9a3b3f1223b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and reward generators. The primary lure appears to be related to 'Blox Rewards' and 'Robux', aiming to trick users into clicking malicious links. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/blox-rewards-game-hack In PDF document text
    • http://torkelson.se/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/best-free-roblox-executor_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
stream_003_off00004772.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4772 26748 bytes
SHA-256: adde95b66364270e18393b7a895cda7c7dddebc1eabd3f5d93289bc2d076bc96
font_01_sfnt_off0000863f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863F 18192 bytes
SHA-256: 9fa72324c8cea46471c46a847a072321e15136d189e875d4b903010c9f48d7ea

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