Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19fb59524814f15…

MALICIOUS

PDF

45.0 KB Created: 2021-05-10 18:27:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c1d38c23ac2cde6bffbde00f72619f0b SHA-1: a722d993a726cd1b1a9c139682b52924b76b2c0b SHA-256: d19fb59524814f157bd3f5c5181580945157f3eeae816f7c19fbf0966bc91128
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including a known malicious redirector, under the guise of providing game hacks and free currency. The document body and heuristics indicate a lure to click these links, which likely leads to further malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/406889139/how-to-hack-coin-master-spin-game-hack In PDF document text
    • http://reggieslockandkey.com/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/robux-website_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/oginject-co_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/block-best-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-redeem-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.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
font_00_sfnt_off00004b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B18 25372 bytes
SHA-256: cdbcd00b963927d59df083f894f1d7c5f0b912500936ea4f0c8fa976eb0c1e92
font_01_sfnt_off0000845c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x845C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0E 18056 bytes
SHA-256: 5e82f79f4c6ef45b1ad688a3ba1018d76c0b9c4c9956dd607c838570fa3f70c1

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