Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2c1771fefb58f6…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 22:40:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9b16daa0c7be8c56fdba374730569e3d SHA-1: aa3a62dc9f992963b0b841798347f94a85d44130 SHA-256: 3f2c1771fefb58f663c8e847f8ed74a2625f18835229aeb3a7e04581fc5626e4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a game hack or generator. One critical heuristic identified a link to known malicious redirector infrastructure at http://netcdn.tw/app/406889139/how-to-get-spins-for-free-on-coin-master-game-hack. The document body and numerous embedded URLs reinforce this lure, suggesting the primary goal is to redirect users to potentially malicious content or download further payloads.

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.tw/app/406889139/how-to-get-spins-for-free-on-coin-master-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/www-free-robux-club_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-broken-bones-2-cheat_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-on-roblox-easy-steps_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-mac-exploit-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/ww-roblox-hack-top_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/worst-client_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pokemon-go-hack-free-pokecoins_GM1094591345.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-coins_GM406889139.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_off000030d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D6 22252 bytes
SHA-256: 603d4232e03af616e73a9c986f42b88c2f4db80fbb1e076e0746b7bb2331a7a2
font_01_sfnt_off0000623c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 18336 bytes
SHA-256: a841261eefc9091920f66d88f6abc9f0517b4e443c58d75395461243cacd8539

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