Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fbcaea8e71691a…

MALICIOUS

PDF

34.2 KB Created: 2021-06-17 16:54:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc9b0fc299c25a862867e96bbececc76 SHA-1: 19c74b3a8624a4aba56d8d7b0c55d9b19da48547 SHA-256: 19fbcaea8e71691acac9111e0ec879f7535bc3dab25211b2b0f32b8f41abc221
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them, promising free game items or accounts. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The document's content and embedded links strongly suggest a social engineering tactic to drive traffic to potentially harmful websites.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/create-free-account-roblox-game-hack In PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/pubg-uc-lucky-draw_GM1330123889.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-hack-script-walkspeed_GM431946152.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_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
font_00_sfnt_off00003075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3075 22084 bytes
SHA-256: eebc5f8278700aa9fad130963aa22808c2031d42a7c7ef4c2bedbdedd2fd0d35
font_01_sfnt_off0000616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616D 18708 bytes
SHA-256: 95a9d7e33de28296be26d167271261307dac6b4d4aa8ea41471f15f3bf3dc239

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