Malicious PDF — malware analysis report

Static analysis result for SHA-256 0833e79d1bd983cd…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 14:18:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 84cd36a0b15c9bf96cdd27af64a0d603 SHA-1: 806ef5e2bc36719b751d3f37612b01546859f3c2 SHA-256: 0833e79d1bd983cdfdc778899377317326f83dc713a16b654f97097be45ec527
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them, disguised as game-related cheats or generators. These links point to a known malicious redirector infrastructure and a large number of other PDF files, suggesting a link farm or SEO manipulation tactic. The primary goal appears to be directing users to potentially harmful content through a chain of redirects.

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/406889139/coin-master-free-spin-and-coin-link-haktuts-hacking-news-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/mechanique-car-simulator-hack-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-scam-websites_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/easy-and-quick-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-hack-roblox-accounts-agust_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-hack-2021-sec_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/erased-citizen-roblox-hack-how_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/digital-bandits-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-hacks-commands_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-hack-the-robine-on-roblox_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
font_00_sfnt_off000031d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D3 22404 bytes
SHA-256: 0b5b746d03837db9589e7be8b3365c04f2ab9e535b248bd7affad2ae755cd62e
font_01_sfnt_off000063a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 18824 bytes
SHA-256: 028a7533a0cffe48b6a3e73a5ec4a7571f128d14e74948211d37bb39bd0384d4

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