Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77c7dca26cff99c…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 07:55:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: de99bbc229edd23b6e484bd591461a84 SHA-1: aa39b8b9acf8e055070d364c5ea9b182f9ac1614 SHA-256: a77c7dca26cff99c77ffd586426fe8a81d828cfe28b7e3c2c4a0c768321a6eb1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, identified as a 'link farm' and 'game hack redirect lure', pointing to websites offering 'free Robux' or game cheats. The document body and extracted URLs strongly suggest a social engineering tactic to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF with high confidence.

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/roblox-cheat-engine-robux-2021-game-hack PDF link annotation
    • https://www.astrospace.com.tw/upload/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-10-000-robux-for-free-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-model-death-star-map-roblox_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/developer-console-script-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/doe-roblox-hacks-work_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/hacking-words-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/counter-blox-roblox-offensive-free-skins_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/minecraft-esp_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-roblox-faction-defense-level-code_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-northern-frontier-hack_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-hack-2021-pc_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_off00002f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F85 21172 bytes
SHA-256: 438326d34061827cb9423ceff03c92e6743334b77b5062a65ab8ad98b19a0442
font_01_sfnt_off00005d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D58 19420 bytes
SHA-256: acccf99aba485f84e7df41928933d39d4b2dbb26759015d7c1840eae17f8a41e

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