Malicious PDF — malware analysis report

Static analysis result for SHA-256 688d0bbfc3d4ce4b…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 08:42:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8fc3700c3782987a29379d019d236386 SHA-1: 0f707109c448e79766d20ee322b2c30e993b5251 SHA-256: 688d0bbfc3d4ce4b5d86d02b0961f5cef0d11142b2f31b412ac134d273cfb0b5
220 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users into clicking on them by promising free game hacks and currency. The primary link directs to a malicious redirector infrastructure that hosts a large number of SEO-optimized PDF files, likely as part of a link farm or phishing campaign. The presence of a download button lure further supports the 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/479516143/free-minecraft-bedrock-server-game-hack In PDF document text
    • https://globair.com.tw/image/data/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-get-free-dominus-and-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/youtube-roblox-pokemon-brick-bronze-free-money-hack_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-hack-roblox-vietnam-war_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/what-is-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-obby-no-password_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/what-do-you-do-when-someone-hacks-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-generator-codes_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_off00002f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F76 21784 bytes
SHA-256: fe33a3d9049fef33979bc040fcf42f9871cc931a51e3e7d0fb59490883bcecbb
font_01_sfnt_off00005f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7D 18672 bytes
SHA-256: 6240c75996215a2b9363c1816ed89e9d7c3b3a872872438457d477396d6a00b8

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