Malicious PDF — malware analysis report

Static analysis result for SHA-256 35affc09294428ce…

MALICIOUS

PDF

35.0 KB Created: 2021-06-18 04:27:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 839c99524badf0a23730bdf1ab9a3ba5 SHA-1: 813c1a427c93a0c3dd1f44cb20b7898a473891b5 SHA-256: 35affc09294428ce0f2c30dfdfc39ec05969efc9d1c9e1d05862a56a6f972219
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically advertising a "free generator / game hack" for Roblox. The document body and embedded URLs reinforce this lure. While no scripts were extracted, the primary malicious function appears to be directing users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/roblox-gift-card-generator-free-game-hack In PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/robux-hacks-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/weird-roblox_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/roblox-hack-robot-animation-script_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/saber-simulator-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.vetmed.fkh.unair.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://vetmed.fkh.unair.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000327a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327A 22232 bytes
SHA-256: eb319546fd6fdc668209bd41cab2c9cdb0e5dad71c8d11a6a5da39c2e81146b1
font_01_sfnt_off000063b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B6 19048 bytes
SHA-256: 4f28ded2ce6b42f7ea91ff8b0811dd96696127a796af2e75dfd6973744ff8c96

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