Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f85b9e8a18ffd7a…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 16:18:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 812f33c433938311b29c96eb3f4cc2cb SHA-1: dc29bbc5b5e0690bbd36a3b32172d46ce9216707 SHA-256: 0f85b9e8a18ffd7a23e7ad0f2e5fec6ed2729a4ef9a58425ced8cb87e29e184a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirectors and is part of a link farm, specifically promoting 'free robux' generators. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings. The primary goal appears to be directing users to potentially harmful websites through deceptive lures.

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/robux-hack-generator-game-hack In PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/add-robux_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-robux-that-actually-works_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_off00005227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5227 27096 bytes
SHA-256: 25a3de0421dbc6f332b87fdc2e6d78d340b895d80561a8aa41f3f31a677117f5
font_01_sfnt_off000091f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F5 18352 bytes
SHA-256: f5433ce3dc9930d213a8e7315569ee207b9df6dd56817c97a1fb358bc14a6a3b

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