Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9555c31951071e3…

MALICIOUS

PDF

44.3 KB Created: 2021-05-19 03:29:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 18015004273e93b7164c2644c2073bf3 SHA-1: dd538d2ae9d0b8a80ba225673a00666a56d9fa59 SHA-256: b9555c31951071e36cbf6f6556c0909e877efb10a818db2cf3abdc135aec5dff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and generators. The document body and embedded links suggest a lure to trick users into visiting these sites, likely for further exploitation or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/how-to-get-free-food-for-foxy-in-coin-master-game-hack In PDF document text
    • http://huananhai.net/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-play-minecraft-online-for-free_GM479516143.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_003_off0000479a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479A 24752 bytes
SHA-256: 74b578020d0eb8ca67f2fd116e0cf846073278d0cf5a95223d2909f9f3604e14
font_01_sfnt_off00008032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off000089d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D3 18440 bytes
SHA-256: a2fd22afb07b2ab97191ea58f041a8e540c79d47e96b45ccd375a5553ae49956

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