Malicious PDF — malware analysis report

Static analysis result for SHA-256 9604f088f9a1fd26…

MALICIOUS

PDF

32.9 KB Created: 2021-06-27 08:04:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 423bb966fdad3626c6bf32a9a12f06ec SHA-1: 6d7d4d257bbbd67d50adb1f5d254c5198a40fdac SHA-256: 9604f088f9a1fd26f4cb4612870ae8db859e0dfcb84f5c24c86be131569f41cc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of providing game hacks and free currency. The document body explicitly mentions 'How To Hack Roblox Accounts' and includes a call to action to access a 'Robux Generator'. This indicates a phishing or scam attempt to redirect users to potentially malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.co/app/431946152/how-to-hack-roblox-accounts-on-ios-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-promo-codes-september-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/hack-para-anime-cross-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/comment-hacker-dans-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-roblox-template-t-shirt_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/protosmasher-roblox-hack-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/cheat-roblox-madcity-money_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/game-hunters-coin-master_GM406889139.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_off00002a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A54 22128 bytes
SHA-256: 64c315030af6f4f733a9191bee31f71278c3ffe11806ee9f04271956ca504fd2
font_01_sfnt_off00005b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6B 19064 bytes
SHA-256: a1f082ad02c9a1b23b7750275f6ea420bc89fe808389d502e7635bceaa41901a