Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73db3b8e90045aa…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 08:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4e6ad158fb562012f7f39ec9ee16622d SHA-1: 73a6e99c6c6d81e7dae8865b19d1c08f460c0471 SHA-256: e73db3b8e90045aac5785c6ce6810e7647a62cc4604d42cba822047b966045bc
300 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, including a fake CAPTCHA and a 'download' lure, to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The document body contains obfuscated text and a URL that aligns with the heuristic findings of a game hack lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 7

  • 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.
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-trade-hangout-hack-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF8 25168 bytes
SHA-256: fcbc9d5aa4b0cf01d46365015f6d62433948849babbde5966de8a309dc145e2a
font_01_sfnt_off00008781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8781 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000912f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912F 18888 bytes
SHA-256: ff9efd44f9ea84a9f560efbc8db99cdecb031e06b41e31d6c1d0494724d0a341

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