Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71ae9a69b1aa844…

MALICIOUS

PDF

54.3 KB Created: 2021-06-09 12:05:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d6ed8c9a1532146953e6a50cdb1fe2d4 SHA-1: 312854a1bb95b843ab1434f3853150cebff16ba4 SHA-256: f71ae9a69b1aa84445ce6b77d980e60cc088969f361c58505b8e322171b0fc39
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors and a link farm, masquerading as "free generator" or "game hack" content. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-2021-game-hack. The document body and embedded links suggest a lure for users seeking in-game currency or cheats, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the structure and embedded links strongly indicate a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9517

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-2021-game-hack In PDF document text
    • http://kontaktadig.se/images/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://kontaktadig.se/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-wiz_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004efe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFE 34284 bytes
SHA-256: c734ade08c34d751259559d73b61b60185b163f4e29b34c72b6b6e02ad560431
font_01_sfnt_off00009a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0E 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000a419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA419 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000b12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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