Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8c7517af252782…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 02:35:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0dfb125face6180840444609aa522e80 SHA-1: 3ee5dfc0c961b894486999ffa37a930bc751698d SHA-256: ba8c7517af252782e6add5a8d98e4c6bf1894dadd536c605a3afb856d793b2ef
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate that these links are part of a malicious redirector and a link farm designed to lure users. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest a high likelihood of the document attempting to exploit user interest in cheats to deliver unwanted software or lead them to further malicious sites.

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-apk-hack-35-8-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-cheat-engine-shut-down-server_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-lua-script-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-park-forest-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-robux-generator-tool-2021-roblox-robux-hack-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/cool-kid-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-passwords-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/download-roblox-paintball-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/breaking-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-games-for-free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-you-get-free-robux-on-survey_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-spins-in-coin-master_GM406889139.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_002_off00003280.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3280 23492 bytes
SHA-256: 7490c51a04852ae6f56d42da3e27ef20b83862c78026cc98052c0920767f3cac
font_01_sfnt_off000067e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E0 18696 bytes
SHA-256: 37466016b432fe2c4302c226887fb4a123f095adabdcdeca05fa6b35b2ac340f

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