Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfbab06755ff22…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 05:00:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 53e47e328e48f56a3d85e28982773c27 SHA-1: 25977f2754bfe942bd107a9553addb04a85c3b5c SHA-256: 81bfbab06755ff229f969be1fa9d430bceed527e29c69276144119205af4efd9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/master-coin-hack-mod-game-hack PDF link annotation
    • https://library.pqm.co.id/repository/hack-de-roblox-jailbreak-2021-dinero_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/como-hackear-roblox-para-tener-robux-infinitos-para-pc_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/roblox-phone-number-for-free-robux_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/roblox-hack-script-executor_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/free-robux-generator-no-survey-or-offers_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/cool-free-roblox-clothing_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • https://library.pqm.co.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.pqm.co.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/how-to-get-a-dominus-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://library.pqm.co.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://library.pqm.co.id/repository/how-to-record-on-roblox-on-pc-for-free_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/lifting-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://library.pqm.co.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.pqm.co.id/repository/how-to-get-a-roblox-hack_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_off00002e5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E5F 22624 bytes
SHA-256: dafcc4dd25bfb36393df701f04c25357196c1070493239b0bacf9817b5d0aa60
font_01_sfnt_off000060e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E6 18180 bytes
SHA-256: ed04b551d40dc3d0b078bebd4df0367427dce1de22e506577ff87439cc2ad0e8

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