Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9ec8144063b58f…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 20:49:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d7b2f3af1606c7cb1eaba99cff73e412 SHA-1: 12d5a60fb958e91ec2a21c2d211009676ec8ad90 SHA-256: ab9ec8144063b58fdff9e46e1a54857334ea35864cd7f40a0d0e8f7bf224482e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and malicious redirectors. The document body and heuristic firings indicate a lure related to game hacks and free in-game currency, designed to trick users into visiting these malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection workflow.

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/how-to-hack-peoples-roblox-accounts-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hacked-pokemon-brick-bronze-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-printable-coloring-pages_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/easiest-way-to-upload-audio-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hey-google-how-do-you-get-free-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
font_00_sfnt_off000031c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C3 22476 bytes
SHA-256: 3c0718cbccea8c72e5a08f67290f2040c9aa8a8658b4eb047e6c3d3e6e6dba1f
font_01_sfnt_off000063c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 19392 bytes
SHA-256: 455054d53819942057d20be51cc97c11c8340df0e33a1662ffdae35838096838

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