Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89c6e5c4b6c43a0…

MALICIOUS

PDF

46.6 KB Created: 2021-06-04 01:43:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3e2eb2df14255a865546e7cc2dab3f63 SHA-1: 7c900c5bc6d0e3515b64cd0a9e16a165e8a9aff1 SHA-256: a89c6e5c4b6c43a0ea7462a69fe1de601cb1eddc68520e6a34f4f417af546c9b
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 0.9748

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.online/app/406889139/coin-master-free-spins-link-no-verification-code-game-hack PDF link annotation
    • http://oca.undil.tl/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/pubg-uc-carding-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-items_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_004_off0000501a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501A 25028 bytes
SHA-256: 3afca9954d33273dd948f775ecfc27c9d0178513306a0a8706629bc78c171e34
font_01_sfnt_off00008932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8932 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000092e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E5 18364 bytes
SHA-256: 32f8b4adb1641f00b1b9d0931c2fb14585cf1e121e0c59b47926bcef0ce50eef

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