Malicious PDF — malware analysis report

Static analysis result for SHA-256 84341cbcce55da53…

MALICIOUS

PDF

44.6 KB Created: 2021-05-13 08:15:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6fbda1fb2c4ebfa78ac279a62b68f6c2 SHA-1: af9fe0939ebbe29a5bdd468fecafc100c858d984 SHA-256: 84341cbcce55da53a558f5244c9e46e3220eef14c1b10d4090fdff73abd899d8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to external sites, including a primary redirector for 'game hacks' and a large number of SEO-optimized PDF links. These links likely lead to further malicious content or phishing pages. The document body and heuristics indicate a focus on popular game-related lures to entice clicks.

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/479516143/minecraft-rtx-download-free-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-top_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/robux-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/dailyrobux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/where-can-i-get-free-coins-for-coin-master_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_off00004834.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4834 25196 bytes
SHA-256: 219f2b120f9849e949cea8d980f994f71d41bf69b755c04f2e6c882fa782c61e
font_01_sfnt_off0000814e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814E 2824 bytes
SHA-256: 61b3a573627d4f03d30684157e1627da3b4499cefab0fdf17b45999135b0250b
font_02_sfnt_off00008af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF5 18500 bytes
SHA-256: 5f3bdd779ddaacede8957d9864e28e9a9e9e2ea303e248dbf894cd003605836d

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