Malicious PDF — malware analysis report

Static analysis result for SHA-256 925a12b85162a63d…

MALICIOUS

PDF

44.9 KB Created: 2021-05-10 21:45:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 44dadda94b9caa7da3892943f387748f SHA-1: 8774be235b007018a9c7111453a36e292cc4d61f SHA-256: 925a12b85162a63daa6f0f68ee0b47f9a13b22e519aae1de41ea6d397e5dc07d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. It contains numerous links to SEO spam pages and a known malicious redirector, suggesting an attempt to drive traffic to potentially harmful sites or distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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-earn-free-stars-on-coin-master-game-hack In PDF document text
    • http://www.homesweethome.pl/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-daily-free-spins-link-2021_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
stream_003_off00004b1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1A 25160 bytes
SHA-256: 64df647277224d4a1175419f73dbaa12c75278566693a29190a25bb6ab9a970e
font_01_sfnt_off0000840e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840E 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E27 17872 bytes
SHA-256: 0709ca684ad5453d4a1c2d42e2fc6702b99f6275411c4f1e468931145e99bc4e

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