Malicious PDF — malware analysis report

Static analysis result for SHA-256 956106b7cccb47d2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 03:52:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2bd8a67bdb9130fcc536ac17d1b41886 SHA-1: 4ff3598f840198c27bd5c93f08a076692f96d5f3 SHA-256: 956106b7cccb47d2b23d16beff782543ca69990e6985c73850a2f3172f2b518d
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/free-bling-bling-card-coin-master-game-hack PDF link annotation
    • https://jdclassicautoparts.com/image/data/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/how-to-tell-if-you-have-been-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/roblox-shirt-template-free-to-use_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/how-to-hack-into-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/hacker-de-robux-para-roblox-real_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-roblox-recorder_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/script-lua-roblox-hack-github_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/roblox-zone-roblox-hack_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/roblox-download-free-hp_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/robux-follow-free_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/r2d-roblox-hack_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/steve-one-piece-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
font_00_sfnt_off000032c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C8 22932 bytes
SHA-256: 0c88baa9fe66ed3245174c7e178bdf90b32452ff387d875631c68097a30165df
font_01_sfnt_off0000663f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 18464 bytes
SHA-256: 9e525174b91ad41fb891ac7cfc07bd8e8020f7e5e3866fd8c2d53bfbd1eafce6

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