Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8c2e9d5befbbbb…

MALICIOUS

PDF

44.5 KB Created: 2021-05-13 12:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7d85ed901fb6c902c54ffaf4134fd251 SHA-1: d00453cc4ff32e37a091b35471a5831ee6418733 SHA-256: 0a8c2e9d5befbbbb73a7b85437d5bb8e5b66544468eb94ba47991d60209d19ae
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple external links, including one to a 'free generator / game hack' lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text but also references the primary lure URL. No scripts were extracted, but the presence of numerous links and the lure suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/free-spins-coin-master-legit-game-hack PDF link annotation
    • https://www.saisystem.it/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/robux-boost_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.saisystem.it/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://www.saisystem.it/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.saisystem.it/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000491c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491C 24632 bytes
SHA-256: 343c7d8fde4e4b805e2ca5a5bf0883cb8e0aa5a0429254044eccb1c9378b2bac
font_01_sfnt_off000081d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D0 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 18176 bytes
SHA-256: 4f85ccc1da016ecef161eb9f79bccb20543dd347b05e2325783b5ea44e0630af

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