Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbc73e02d31aa9b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 12:05:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4a9c6691d2ce8a398ff4aa00c143ae37 SHA-1: 1f27af91ed9b1e072f2cf2da6db33002d179774b SHA-256: ffbc73e02d31aa9ba43554d8cd2feec75fbe48610d43628a28fb8c429e8b77e9
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are presented as 'game hacks' or generators for in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or redirector setup. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded URLs point towards a phishing or scam attempt designed to drive traffic to potentially malicious sites.

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-spins-coin-master-app-game-hack PDF link annotation
    • http://mbbs.hr/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-without-human-verification-or-survey-or-offers_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-for-samsung-s3_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/do-you-gey-free-robux-with-builders-club_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_off000031b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B7 23292 bytes
SHA-256: 85cbcad203eac3d63acb4d7606d41f0484c7eaa126dcf0041e4bbd36eae09416
font_01_sfnt_off00006625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 18176 bytes
SHA-256: e95ed07f9a3392ac9f393b6d3cafc9f79ae200f6e0f71949f87052ae7f0648e8

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