Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceb8fe7a7400e91…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 15:46:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9bf062beb5dff8ec6043d06f284f57dc SHA-1: e226418552e9b78491736d3449619265dd526496 SHA-256: 4ceb8fe7a7400e91dc9f6f91e42040c06fa5c00f7fa74906ac0252a866bffec5
220 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and SEO-optimized pages designed to lure users into downloading potentially unwanted or malicious software. The primary lure is related to game hacks and free in-game currency, a common social engineering tactic. The document body and heuristics confirm the presence of malicious redirector links and a lure for game-related downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/install-roblox-free-for-pc-game-hack In PDF document text
    • http://d-cision.nl/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/roblox-promo-codes-2021-robux_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_off000050f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F6 26952 bytes
SHA-256: 25f9baa2728e4dbbc3850c33a4a9ad0d2978e6c88ce698a0c1be1c3dbe7f4ac2
font_01_sfnt_off00008e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E31 18436 bytes
SHA-256: 508a9da8d7a2a26bbcdff183c8f1b298b90f190c096e133616306352c57f67a9

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