Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8d33e61730ccda…

MALICIOUS

PDF

43.4 KB Created: 2021-05-12 14:16:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e5d28bcc4c860fb888de51c25b8d8bc2 SHA-1: 21e0fc8ea82efdc8264355e0d3861c1485bf908b SHA-256: 7c8d33e61730ccdad2a19f1123bca6c69c24c30910855ca00057afcad1a2188d
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 0.9969

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-link-blogspot-game-hack PDF link annotation
    • https://jugendfeuerwehr-scheinfeld.de/images/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://jugendfeuerwehr-scheinfeld.de/images/robux-hack-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_off00004ca4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA4 24996 bytes
SHA-256: aaa437d1e12a1aabb37bf530b3babe5ac1b5ee235f1a526d23452133f1c13c8f
font_01_sfnt_off00008640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8640 18632 bytes
SHA-256: 25a48d095538c21b3574d128913f1d88808f27fbb4560e17bb648f934a14342e

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