Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef4aece6e89adc6…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 18:23:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e121d380792ace8a8f85642c36e544c7 SHA-1: c9eefefdddc5a4740df9fad98db8c273905d4f09 SHA-256: bef4aece6e89adc610b0fe1a09f88bbfd94e01dc1de34420d9f8be298c19e047
220 Risk Score

Malware Insights

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

This PDF document employs a common lure for game-related cheats and hacks to redirect users to malicious infrastructure. The document contains numerous links to external sites, many of which are likely part of a link farm designed to distribute malware or facilitate scams. The primary redirector URL is identified as malicious, and the ML classifier strongly indicates malicious intent.

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/406889139/hack-coin-master-spin-android-game-hack In PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/hack-jailbreak-roblox-2021-money_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/how-to-to-hack-joining-sumones-server-roblox_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-roblox-hacks-like-jjsploits_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-free-robux-no-hack-2021_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/new-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-robux-no-human-verify-or-download-2021_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-speed-hack-jailbreak_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-free-robux-promo-codes-list_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/minecraft_GM479516143.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-script-injector-free_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/robux-hack-no-games_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-account-roblox-with-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_002_off000030bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30BC 23260 bytes
SHA-256: 19cee765e6bb61bec82fa39a81c66cb42e3eaf238f02ffd07bd3e350d63645ab
font_01_sfnt_off00006520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6520 18352 bytes
SHA-256: a07aa63f24b352fd81218d8ca65e21e458501f47c11eb6d03a85a06766069f6e

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