Malicious PDF — malware analysis report

Static analysis result for SHA-256 f635a6e3e335cce5…

MALICIOUS

PDF

34.3 KB Created: 2021-07-07 06:40:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9560bdc7af9eddbf81d64dd434777104 SHA-1: 6bf71168f61e9d35d8174a3d6a06a2b78fa487bc SHA-256: f635a6e3e335cce54bb26a8adb8b7d71ab8a16e6b0feef32edc7528f3dda6225
220 Risk Score

Malware Insights

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

This PDF document contains multiple links designed to lure users into clicking on promises of free game currency or hacks. The primary link redirects to a known malicious infrastructure, suggesting a phishing or scam attempt. The document's structure and embedded links indicate it's part of a campaign to drive traffic to potentially malicious sites, likely for credential harvesting or malware distribution.

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/406889139/free-coins-coin-master-spins-game-hack In PDF document text
    • https://purihostel.com/assets/CKImages/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-how-to-get-free-things_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-hack-roblox-mad-city-gui_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/veil-roblox-hack_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-hack-unlimited-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-generator-no-surveys-and-no-human-verification_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-use-roblox-hacks-multiple-rbx-games_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-hack-a-trade-in-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/pokemon-go-free-coins-hack_GM1094591345.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/robloxheroxyz-free-robux_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
stream_002_off000030c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C7 22684 bytes
SHA-256: 1454ad0321661197ba30ff367299a4d31fc6eb89acd581b5adab963f5856f1db
font_01_sfnt_off0000638c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 18176 bytes
SHA-256: 9c216cc6aa1e94c18ff26070eb99056dac407022fd31ef3f29cf2ac34e799f34

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