Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b4a097b38a03ab…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 14:57:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: acc4a15eb937f118f1bc7f59f91b1ac4 SHA-1: 692426e56362269fbfa0369def39c3ed0e52e9a4 SHA-256: 74b4a097b38a03abf007daa1a78001bb78a0d84d37c3ddb730a5d82fc8f4b64f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to malicious redirectors and link farms, disguised as generators for in-game currency like Robux and Coin Master spins. The document body explicitly mentions 'Free Robux Codes No Verification 2021' and includes URLs that are known malicious redirectors. This indicates a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/431946152/free-robux-codes-no-verification-2021-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-promo-codes-for-free-stuff_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-tiktok-followers-app_GM835599320.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
font_00_sfnt_off00002edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDD 22524 bytes
SHA-256: 9e7aa2ec962327eadbef2aff8740bc7a356480b61933444bb7c7b38f8caf4570
font_01_sfnt_off0000614e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614E 19648 bytes
SHA-256: c9b5e446bd4f49308c598e64be383601662d64f1913011d813836102a9eea03a

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