Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bc143dde0e31ae…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 01:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: db11077e7452c5a3923aca35b7b36b34 SHA-1: ac3ac2111f518f65deb3d0f55a44f5f1ee4289e6 SHA-256: b0bc143dde0e31aed7bb038c9f56f2d4992599736955bc5f12e4a5541f36bcf2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, with a primary link identified as a malicious redirector. The document body, though partially corrupted, suggests a lure for game hacks or generators, aligning with common phishing tactics. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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.tw/app/431946152/sonic-shirt-roblox-free-game-hack In PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/corn-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/robux-sign_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/xray-hack_GM479516143.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_off00004f2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2C 25460 bytes
SHA-256: 58bd75e36a3ae325ac3f45b20b8205728bb0c7b113fe6694898f7ab30823c399
font_01_sfnt_off000088ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AD 18340 bytes
SHA-256: 42baed03a0510f56a106b697ad26e47222a6e9fe2f66219ad5ddc17a51541f04