Malicious PDF — malware analysis report

Static analysis result for SHA-256 526f81d4d335d1be…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 08:44:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ce87ca8c397a51113a3d34ec286ac99a SHA-1: 22b77c6802ba7425d2ba95dcee6a02ea9c8e6cae SHA-256: 526f81d4d335d1beb5ab37393633fcdaa2bf10677f809e73900d05b464ba9c44
220 Risk Score

Malware Insights

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

This PDF document employs a lure for free Robux and game hacks, directing users to a malicious redirector URL. The document also contains a large number of links to other PDF files, likely for SEO manipulation or to host further malicious content. The primary malicious activity observed is the redirection to potentially harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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-robux-games-that-actually-work-game-hack In PDF document text
    • https://de-licht.com/image/data/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/youtube-roblox-cheat-engine-arcane-adventures_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/bexgg-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/robux-free-now_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://de-licht.com/image/data/files/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-free-weapons_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/como-ser-hacker-en-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-18_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/roblox-free-download-apk-uptodown_GM431946152.pdfIn PDF document text
    • https://de-licht.com/image/data/files/free-minecraft-printables_GM479516143.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_off00002f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F88 22348 bytes
SHA-256: 86f9e9b63f41836adc3832fab34b797b1f70f44ec094c407753cddf5e7a9b616
font_01_sfnt_off000061a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A0 19868 bytes
SHA-256: d6d6c21ebfb94ec66429bf50c50e6ebacf9910fb21d66d19805e4ed0a6b06ac7

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