Malicious PDF — malware analysis report

Static analysis result for SHA-256 f735ab6694848215…

MALICIOUS

PDF

52.1 KB Created: 2021-06-11 00:10:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 147ef8963d6006cbe3e67538b006835b SHA-1: cf704adbbc6e5074d3c21e4606be8c5eccfe47f4 SHA-256: f735ab6694848215086fbc6876a1793c5c2d19aead36c0e88487294e32c97c77
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a link farm, masquerading as generators for game currency or hacks. The primary lure is 'free Robux', directing users to a known malicious URL. The document's structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.tw/app/431946152/free-robux-no-human-verification-2021-trackid-sp-006-game-hack In PDF document text
    • http://foo.com.tw/files/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/moon-active_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A8 25460 bytes
SHA-256: d4cd6f0fcb19b08a236e1b3e04b4ad2222a81631fc9d9c4bcd1b1084352cc955
font_01_sfnt_off00008c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C61 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000966c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA37E 19984 bytes
SHA-256: df1c60906164bfa68c5a3a6532510d99a2034ea5482265e0d441427170850ed8

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