Malicious PDF — malware analysis report

Static analysis result for SHA-256 731b3bca3201a770…

MALICIOUS

PDF

44.5 KB Created: 2021-05-12 12:05:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3b0422fb95d03b3a6c0b4a15a4b40115 SHA-1: a1f8e9756379944093b3aa78d9a68b6bd3dbe831 SHA-256: 731b3bca3201a770b44f46081c0dded5976e05daa6ad5f4ede50639aa1e04ad7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, all masquerading as generators for free in-game currency or hacks. The document body and heuristics indicate a lure for users to click these links, likely leading to further malicious content or downloads. 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/coin-master-free-gold-cards-link-2021-game-hack In PDF document text
    • http://bgnails.nl/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/rbxdemon_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://bgnails.nl/images/how-to-get-free-robux-for-real_GM431946152.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_off000047b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47B5 25060 bytes
SHA-256: e67ee04461e156b1a36cf18b1450c4943775aa62ea482c381076b49f8d0ee6f4
font_01_sfnt_off00007fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE7 18532 bytes
SHA-256: a79e7cb72d84571651012e39c641e7e9f676cc5eff01d5029647c2118b2a51b7
font_02_sfnt_off0000a2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C2 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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