Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b4b8021b27e670…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 04:34:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 225d316177ee5fcb92455ce316d074ab SHA-1: 13a7ec0a1df55934b5f57a94f82baebafb844cdd SHA-256: 45b4b8021b27e6707569a2633b5b2f8a08255cacd41d22dd6ebaeeb4f80ed37b
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/431946152/free-robux-on-phone-game-hack PDF link annotation
    • http://reisebild.eu/images/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://reisebild.eu/images/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://reisebild.eu/images/coin-master-free-spin-link-new_GM406889139.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_off000049a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A6 26232 bytes
SHA-256: 9f8d26b7471fec2b022421ed318642ca3b43a8a2821b73b0a1d5ea250f07fa14
font_01_sfnt_off00008475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8475 18332 bytes
SHA-256: a8c9403bd24fc6ffbb74b72c8864e8746fc5e9ab0f3a7e731dec7195ce2a3638

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