Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ba8dd3ba2e07c5…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 22:57:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 140bef3501fe1f4be68b1eb5e556bffb SHA-1: 171388480d5cc0586d900f29de7bf6d4a12df229 SHA-256: 33ba8dd3ba2e07c56d77d3fa0b4be9d06d38d04d904c6ad90e4041fae32ad42f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary lure to 'get-free-robux-2021-game-hack' on netcdn.tw. This indicates a social engineering tactic to trick users into visiting a potentially malicious site. The presence of a large number of external links suggests a link farm or SEO poisoning attempt, further supporting the malicious intent.

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/get-free-robux-2021-game-hack PDF link annotation
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/how-to-make-a-hot-boy-character-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/how-to-hack-bc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/roblox-hack-by-robuxian_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/exploit-engine-roblox-free-no-virus_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-codes-for-roblox-nfl-2_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3kediri.sch.id/__statics/gudangsoal/files/free-online-games-like-minecraft_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
font_00_sfnt_off0000324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324C 22540 bytes
SHA-256: 1b6da8a042aa9d0c9d7aa6df51e25b59bc796c975cfbcf8ebfb980db12e36755
font_01_sfnt_off00006499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6499 19224 bytes
SHA-256: 821bcaeb5baca65cbb25255ca6205972482cf4d6c0082e9a42268983cc7c06a1

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