Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34f83777e1decf8…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 07:01:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e6aa6bdeeb29b181d1d548f5b18f4ef SHA-1: 212a60720e684282f6777a15c43bde14f38d451d SHA-256: f34f83777e1decf82d632d241cedafaa1ef1026550a590f0a10066fbaf996dac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-roblox-toy-codes-not-used-game-hack. This redirector is used to lure users with promises of free game items or hacks, likely leading to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/free-roblox-toy-codes-not-used-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/9-legit-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheats-for-egg-farm-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-mining-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-offer-website_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-mods_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-change-name-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-no-human-verification-android_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-weight-lifting-simulator-hack-to-get-super-strong_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pokemon-go-free-promo-codes-2021_GM1094591345.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-hacks-new-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-ss-excutor_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-2021-jefftech_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A8 21924 bytes
SHA-256: f5c0af8d9c34a87deef96767c15425b16019a104a4fb5ada8ad34025fbb2ce32
font_01_sfnt_off00006217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 19108 bytes
SHA-256: 7e46580f317f2341111cc3e3bb4543cf5aa0b0f80032ba117b7a990766b99810

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