Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16997ea87478cc9…

MALICIOUS

PDF

45.9 KB Created: 2021-05-10 21:05:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 41fb196a0bf1f13119488b09925edd28 SHA-1: d0310d3a183c7a7285fbdfa807f17d14a8fb7b47 SHA-256: c16997ea87478cc9fb37f560948ef28c3c8cb87225607b919a105e2b11177af7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains multiple links, including one identified as a malicious redirector for 'game hacks'. The document body and heuristics suggest a social engineering tactic, instructing the user to click links or potentially run commands, consistent with ClickFix attacks. The primary malicious URL identified is https://netcdn.xyz/app/479516143/minecraft-pocket-edition-mods-for-free-game-hack, which likely serves as a gateway to a malicious payload or scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/minecraft-pocket-edition-mods-for-free-game-hack In PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/simplysarc_GM479516143.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-hack-com_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_off000050de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DE 31556 bytes
SHA-256: 6abec31ddf2a75c7a56008cc97a681b44933424ea1c629d6f2aa41379e8421c4
font_01_sfnt_off000091ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91ED 18208 bytes
SHA-256: 52725ebef45a42bab5f52f4296d4c65b292dd882fbab5616e23215bf8ac92a4c