Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a38e6d3bc4803…

MALICIOUS

PDF

40.7 KB Created: 2021-05-17 13:01:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c3ea32f09801fc91571297cbc13d90dd SHA-1: 02acc584de192190dfc8e978c08c3bc5769c97ea SHA-256: 841a38e6d3bc4803f21d75ffc13566cf951914704a1d1a1fd2cc91c8a5dd5448
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to 'netcdn.xyz', which is flagged as a malicious redirector. The document body and embedded links suggest a lure for free game currency or hacks, a common tactic for phishing and scam operations. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 3

  • 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.
  • 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/how-to-get-free-robux-fast-and-easy-game-hack In PDF document text
    • https://uofk.edu/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/roblox-character-free_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/robuxmatchcon_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-pe_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://uofk.edu/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/get-coin-master-spins-free_GM406889139.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_off000049f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F8 28928 bytes
SHA-256: 5fe3085619950fa82f51b634b0ec40a954c3747375fe08d1487cd5671a39149c
font_01_sfnt_off00008b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0D 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf

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