Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfbbd8d3123b960…

MALICIOUS

PDF

52.1 KB Created: 2021-06-13 17:00:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d462b1a336f49a6c5dcd6361f4389db8 SHA-1: 344c8f262ce42b4f85cfd1968ce66de77df981f8 SHA-256: 8dfbbd8d3123b9604c10a25cbeb38aaa3e48e1722dedc95539ef36bfe40ab631
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' and 'game hacks' as a lure. The document body and embedded URLs reinforce this theme, directing users to potentially malicious sites. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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/free-robux-without-human-verification-no-survey-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/restaurant-tycoon-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-roblox-virtual-item-codes-for-shirts_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005102.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5102 24960 bytes
SHA-256: b100223eed1d9f1b2c9b709f1c5afbd84d158c423b8b1acc5c0c9577d1ef8669
font_01_sfnt_off00008a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9D 8252 bytes
SHA-256: 7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea
font_02_sfnt_off0000a5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B2 19520 bytes
SHA-256: d38c96854f94283cece0809594c82d2112b4818dd015bf866618a27d2c219b04

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