Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a35f15f50583a…

MALICIOUS

PDF

46.9 KB Created: 2021-06-11 06:20:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5b8e97f0a1933a03b8df8a807ac90910 SHA-1: 58eb1766d91100cd3d38880f3b46b3718aaf7129 SHA-256: 914a35f15f50583a89981019c2820cf5989bc06bab596cf5d52f4f7ef0772e55
200 Risk Score

Malware Insights

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

The PDF document contains links to known malicious redirectors, disguised as game hacks and generators. It also presents a fake CAPTCHA to trick users into interacting with these malicious links. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-hack-into-the-big-brother-house-roblox-game-hack, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-hack-into-the-big-brother-house-roblox-game-hack In PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/cheat-roblox-money-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/free-robux-generator-with-color-verification_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/software-for-cheat-engine-66-to-not-make-roblox-crash_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/free-robux-for-tablet-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/roblox-free-acount-with-rogue-linrsge_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/free-redeem-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/free-40-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/roblox-cheat-dungeon-quest_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/high-level-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/adopt-me-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/roblox-dinosaur-sim-easy-downloading-cheats_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/roblox-booga-booga-cheat-engine-codes_GM431946152.pdfIn PDF document text
    • https://www.lubar.it/wp-content/uploads/fsqm-files/roblox-cheat-codes-feeling-of-falling_GM431946152.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
stream_004_off000053e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53E7 26740 bytes
SHA-256: f9176644ad8040e4ff4bc2d35f0a691c068db41554d3e9471c7abb168eaefdd2
font_01_sfnt_off00009255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9255 19164 bytes
SHA-256: 2317e68e61ad07753da6ff5df49981de616de1cb0717ccce19f7b38ce2c81535

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