Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8df881ab18a610…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 06:14:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ecd1c6cf329b39b221918debce5e1feb SHA-1: af10fd089012013901ef766691cfa0d888c7fe96 SHA-256: 0a8df881ab18a61067f1c7b38097a941b98c26ebeb23630bca543ba041af3864
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 0.9971

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 https://netcdn.xyz/app/479516143/minecraft-for-free-on-phone-game-hack PDF link annotation
    • http://haertetechnik-steinbach.de/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/add-robux_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://haertetechnik-steinbach.de/images/roblox-free-robux-no-verification_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_003_off00004967.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4967 26092 bytes
SHA-256: 8385358d1bcbfcc2a875c884912e5637c50b1893861a6fe8e4e271161eef52d4
font_01_sfnt_off00008217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8217 18032 bytes
SHA-256: 03f24e9b7df13ddf2a61f787c3fe001e8b6ca75c509430b262bdd287118d54e8