Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a16d5a429a5a82c…

MALICIOUS

PDF

41.7 KB Created: 2021-05-13 03:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 02157b21b29f09265cd7656bf2115de1 SHA-1: 304f9a3281e96b1bd770b6d504b5b26f79cd9f1b SHA-256: 5a16d5a429a5a82c4918ebbaa2640ad51836beab2e7e0a528dda42bf63e8086c
240 Risk Score

Malware Insights

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

The PDF document contains links to malicious redirectors disguised as game hacks and free generators, impersonating brands like Facebook. It also presents a fake CAPTCHA to trick users into interacting with the malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to download a second-stage payload.

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.
  • 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
  • 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.xyz/app/431946152/roblox-system-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.xyz/app/431946152/roblox-system-game-hack In PDF document text
    • http://centr-expert.su/images/coin-master-game_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-minecraft-account-list_GM479516143.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_off000048a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48A1 25076 bytes
SHA-256: 2f58c4f60188b1d827d3a84446190cc701b7b74285f8624d8f194e5e2c0012e4
font_01_sfnt_off00008032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 18328 bytes
SHA-256: 00842c74fa3c26a16ae32436b275a2230c03f77988fffeb41884b4851770a755

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