Malicious PDF — malware analysis report

Static analysis result for SHA-256 287615168cb9b8c0…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 12:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00de1e2571540b6760c424852c1663ef SHA-1: 7030fa45c7538ca6bc549678fd344a05d51dc158 SHA-256: 287615168cb9b8c0fe4af4ecfcadef570aa96d104655e5fb5b3eb9838cc11840
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing tactics to trick users into clicking links related to game hacks and free currency. It contains numerous links to external PDF files and a primary redirector URL, indicating a link farm or phishing campaign. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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.tw/app/431946152/how-to-get-robux-fast-game-hack In PDF document text
    • https://knj.com.tw/image/data/files/counter-blox-roblox-offensive-hacks-2021-slurp_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-dominus-site-robloxcom_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-actually-get-1-000-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-penguin-in-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/marshmello-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-backdoor-hacking-roblox-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-paypal-cheat_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/earn-points-earn-free-robux-by-completing-simple-tasks_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_off00002e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3F 22336 bytes
SHA-256: 8a4e316717e834453b0c9153eb399fa832e127cf402b120ce24c5bd6a394bd38
font_01_sfnt_off00005fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 18984 bytes
SHA-256: 8f7f7d5cf2de43eb6e8e879c9f9a169600b9b4f474cc1f6a18409bcba38a170a

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