Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df2e2ba77870dc8…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 11:58:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4bca2717533563d84c5b8a80dad09089 SHA-1: a08ff54cf5593d3ffc9e801457faa6e76988e03f SHA-256: 7df2e2ba77870dc8485b75757b08b6d6b26953347c81003a94d9f5950d4e0bc5
260 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free in-game currency to trick users into clicking malicious links. The document impersonates brands like Facebook and Coin Master, directing users to a known malicious redirector infrastructure. The presence of numerous SEO-optimized PDF links suggests a tactic to broaden reach and potentially distribute further malicious content or phishing pages.

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.
  • 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/406889139/real-coin-master-hack-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/406889139/real-coin-master-hack-game-hack In PDF document text
    • https://www.hotschool.com.au/images/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://www.hotschool.com.au/images/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • https://www.hotschool.com.au/images/coin-master-computer-hack_GM406889139.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_off000049c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C7 25132 bytes
SHA-256: b6212e197cc40657f23c1364781cfdf2e9b55c247c5ff1438853bf4c450c956a
font_01_sfnt_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 17788 bytes
SHA-256: c971b34c329d205054a16b1b5f827a74783bca0f841d374511d085dfea161b8f

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