Malicious PDF — malware analysis report

Static analysis result for SHA-256 561595e39bf7d752…

MALICIOUS

PDF

34.2 KB Created: 2021-07-09 11:26:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0eb4ee6f38f722d9cc9d8246a4cd11ac SHA-1: e428782ed975231e03d10c6c1d6ea15f3d52ecf8 SHA-256: 561595e39bf7d7528409ffaadf5a5ceeb85594dfd9699d2b262a689b2acefc1a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a 'link farm', designed to lure users with promises of 'free Robux' and game hacks. The primary URL http://netcdn.tw/app/431946152/free-robux-real-2021-game-hack appears to be a redirector for potentially malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest a phishing or scamming attempt, likely leading to further malicious downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/free-robux-real-2021-game-hack PDF link annotation
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-skin-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-roblox-hats-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-items-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-hack-a-roblox-account-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-kids-games-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-how-to-get-free-robux-with-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/mc-hacks_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-anything-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/robux-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/get-free-robux-generator_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_off00002e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E2F 22420 bytes
SHA-256: 1cd9e46d1c48fa23b8eb449ee05ecb5b75e2856d8f23660665b994f3a9813079
font_01_sfnt_off00006025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 19192 bytes
SHA-256: 0a56f38ee828cc338b4ecf6fd69a1c4ab782641ccce74c835442ee7dbad06135