Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b055348830c38b…

MALICIOUS

PDF

50.5 KB Created: 2021-06-09 17:38:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e03a34fd8566613fc3f6577d6e47dd04 SHA-1: 097c1060e0bd8129114fa570f4450472346a4292 SHA-256: 91b055348830c38bd01862f1c32f5241c1288d4d86da5398a39ca43c0929f457
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for game hacks and generators, impersonating the Facebook brand to trick users into clicking a malicious link. The link redirects to known malicious infrastructure, indicating a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious workflow designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/roblox-noclip-hack-download-ipad-game-hack.
  • 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 https://netcdn.tw/app/431946152/roblox-noclip-hack-download-ipad-game-hack In PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/robux-free-ohne-handynummer_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-gamepass-script-hack_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-free-admin-house_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-800-robux_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_off00005134.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5134 29712 bytes
SHA-256: 9126a9e46f067a7d78ec63c50b14a33a702ef68cd1d3ed2dc31c8316a2135e7c
font_01_sfnt_off00009724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9724 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off0000a0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BF 18984 bytes
SHA-256: 7214d0b1d5784bbd01d863a1fde501a9c3d25acf5ede282753738f0736fb9b5c

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