Malicious PDF — malware analysis report

Static analysis result for SHA-256 635b4f6d8119a036…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 04:49:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1c86eb5650eea9056b7fed316fd2de58 SHA-1: d9c62c50502a673f3ea738eb9ae3527dedc19832 SHA-256: 635b4f6d8119a036e1fcb97188bc8274e53ce75758a605207678184dd39a3fc7
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free game hacks and robux to trick users into clicking malicious links. The document contains multiple embedded URLs pointing to redirectors and potentially malicious content hosted on IP addresses and domains associated with malware distribution. The presence of a password-protected archive lure suggests an attempt to bypass security controls by encrypting the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.co/app/431946152/advia-roblox-free-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/get-free-robux-fast-and-easy-no-offer-no-verification_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-mobile-cheat-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/assassin-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-do-you-lv-up-in-hacking-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-roblox-t-shirts-that-are-cool_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-emotes-free-link_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/como-tener-wall-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hack-game-launcher_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/wearedevs-roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robuxian-get-2021-free-robux-daily_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-free-robux-no-human-verification_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_off00003092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3092 22816 bytes
SHA-256: 19534a54b8527017b9545aae69f49747ffd18f229454b0160f14e6b65034627a
font_01_sfnt_off0000639d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639D 19056 bytes
SHA-256: 0d23ccc3ea3e2c4e46b5cfaba14fcee45faa620b597030e9ec8399ac4dcf6e52

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