Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2b1635a816a7e5…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 14:33:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4f43315c002dfa8ed55752cd69b78fff SHA-1: 59764b7c07317c3cfd1af5b76a842aee1aaa27a3 SHA-256: fe2b1635a816a7e535e7f064ea6d1c3fc1ddd1fa9c13d2770759bfea00e4ced1
260 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure and a "free generator / game hack" lure, designed to trick users into clicking. It also presents a fake CAPTCHA, a common social engineering tactic to bypass user caution. The document's structure and content strongly suggest it is a malicious lure intended to lead users to potentially harmful websites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/how-to-get-free-robux-promo-codes-game-hack In PDF document text
    • https://globair.com.tw/image/data/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/wurst_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://globair.com.tw/image/data/files/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_003_off00004904.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4904 24828 bytes
SHA-256: d5a218a5657af20c92725f86b317821df60b201cc2463938abc990add460d905
font_01_sfnt_off0000813e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813E 18872 bytes
SHA-256: 5ac59f2bbd716fa5a12c7062aef47b6358464a1e75e3d61e5fb3ce0da7ae841b

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