Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f5f45bc680460a…

MALICIOUS

PDF

48.2 KB Created: 2021-05-16 20:32:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 770192c0576ca6b04ce6439690bb80d2 SHA-1: 5177e8626c3e359b359d7d655cdbf0b6b0188fcf SHA-256: f0f5f45bc680460aa68b3ba387762d1c9c29279bbd2cc2bc7cc7d73223e16ba5
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 0.9013

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/coin-master-free-spins-ios-2021-game-hack PDF link annotation
    • https://www.flexcable.com/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/robux-match_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-spins-link-2021_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_off00004e37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E37 25528 bytes
SHA-256: 1ae7f094b2a530cfadbffe5367187223e651d5b59f0f3eb9e55807f5d605e06e
font_01_sfnt_off00008815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8815 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off00009a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2E 18288 bytes
SHA-256: 2b6efa5e62152ff8c49d64075f52aeeb5d732445f14fabab56fec2f8f3dafea1

Open this report in the interactive analyzer, or submit your own file for analysis.