Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bcd1af0ef693a4…

MALICIOUS

PDF

45.6 KB Created: 2021-05-11 13:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 74b2345472eed2026f07c74f077eb93b SHA-1: 2e426103a9d0528d6a099fde01f65fcc82acf8b9 SHA-256: a8bcd1af0ef693a4bb07bfefe9723354820f0f80efce3f774a3c646047c12a50
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, masquerading as generators for game currency or hacks. It links to a known malicious redirector infrastructure and hosts a large number of SEO-optimized PDF links, indicating a link farm for traffic manipulation or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/free-spins-and-coins-for-coin-master-game-game-hack In PDF document text
    • http://s-punkt-objects.de/images/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/roblox-demon_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://s-punkt-objects.de/images/free-spins-on-coin-master-generator_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_off00004c15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C15 25292 bytes
SHA-256: cd42a0e49f4d6e9c20f0261f3b6101876f52b586152495b2fee0d85a6c214671
font_01_sfnt_off000085e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E2 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCD 18320 bytes
SHA-256: d1cf6b486e789d6a7a281824944966070be141b92be060b449a52bae7023ebff

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