Malicious PDF — malware analysis report

Static analysis result for SHA-256 b584637dd67fe5f5…

MALICIOUS

PDF

46.9 KB Created: 2021-06-04 04:40:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 77f9add13c1ebe3f292f864a2db7cc32 SHA-1: fae71e15a11d5fdfc04e89da0552a11e2389240a SHA-256: b584637dd67fe5f535d5eca8efc7c6c29a1d562f2436022a906cacb96e4be522
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a critical redirector to a site offering 'free Robux' and 'game hacks'. The document body, though partially corrupted, also contains similar lures and URLs. This indicates a phishing or scam attempt designed to redirect users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/free-robux-without-downloading-anything-game-hack In PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-robux-without-verification_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
stream_004_off000053cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53CB 26368 bytes
SHA-256: 8d7bec2bd8db5e731918dd86630db2126f4b8247f82eebf78ed05fc926e92cd9
font_01_sfnt_off00008ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFD 19880 bytes
SHA-256: 6bc5cab104a17e5be196146aaeb40b5940258b3e295a46c016ac1ce7c3ec9493

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