Malicious PDF — malware analysis report

Static analysis result for SHA-256 049c820a164a5edc…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 12:37:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3e8ee72f72d7d81b9a7795b3f27af5b9 SHA-1: 100c9b357200dc7481c7ae8182254f4c498021b5 SHA-256: 049c820a164a5edc61711a463f02be3523445a7218ec1233cd70c5bbb5733c5a
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 0.9865

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/how-to-get-free-food-on-coin-master-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-tiktok-free-on-ipad_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-2021-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-new-free-hairs_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005383.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5383 25964 bytes
SHA-256: fe54bf5142f949cd784074fe23aa534feaf720a61800cc24b1a65e5a52082aa8
font_01_sfnt_off00008e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9D 18048 bytes
SHA-256: 80f71b64fdae1376f671ee29083f27768c0f143acc59e91e746c89af89705883

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