Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1db1951ced92f5…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 21:22:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 876a1079c3c97ca77d2aadf7b519ac37 SHA-1: 6b5a890808154e85843aed157a44152c94ee659f SHA-256: aa1db1951ced92f56af48b361f9bba11a5cd45674fdb36b5313e105aacd8138b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and generators. The primary IOC is a URL that leads to known malicious infrastructure. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

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/roblox-comcom-game-hack In PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/you-want-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/roblox-client-hack_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/hack-to-kick-out-roblox-players_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/rob-hacker-online-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/hack-para-roblox-de-romper-pardedes_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/infinity-jump-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/freecoins_GM406889139.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • https://www.stylafik.in/uploaded_files/userfiles/files/execute-freerobux_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
font_00_sfnt_off000030d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D0 22452 bytes
SHA-256: 7c1f355c1d3fc491e39477a42a10b94681510471cb3f6d46848064217cb0f701
font_01_sfnt_off00006273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 18748 bytes
SHA-256: 78e21a6f7b26635aecbcc327ddb8855eecfad539c3b4b1802bdc788eaf0ee2ad