Malicious PDF — malware analysis report

Static analysis result for SHA-256 f481b2b851d7ec37…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 13:01:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ae203b3ce1f81fe6a666bddb94570888 SHA-1: 52a6e65ffd5516d5a1ae33b8026a6749424c900b SHA-256: f481b2b851d7ec37461284df677fe275b2d7db211496e2bc5fbeacda5b0224a4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks and free currency, likely designed to trick users into visiting malicious sites. The presence of a visual download button further supports a deceptive workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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 https://netcdn.xyz/app/406889139/free-mod-apk-coin-master-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/get-me-free-robux_GM431946152.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_off00004b30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B30 24816 bytes
SHA-256: 0f4c5ef09bc4e7bfd04e8f2e8ee813a248b0c36d5f7cf05880e348eafba911fb
font_01_sfnt_off0000840f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840F 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F39 18228 bytes
SHA-256: 94a160b3eebda81a774dce60345efae5de7f6df629fda5b11a26048b94d99866

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