Malicious PDF — malware analysis report

Static analysis result for SHA-256 7461613a3b649eca…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 14:11:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 059dfa3551d20a8c23293eab797af01a SHA-1: 65ba25066062a1dc2b185c87016079f10246751f SHA-256: 7461613a3b649eca22348ff5e370c32061fb0cd957d70ae17eaca277bb49780b
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 in-game currency or virtual items. It links to a known malicious redirector and a large number of SEO-optimized PDF links, indicating a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-daily-spin-free-game-hack In PDF document text
    • http://skwolcott.com/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004774.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4774 26660 bytes
SHA-256: a93c31ec51014723fb3889bf6b7f51b78e1aba7edc033ff62d86a9a17551431d
font_01_sfnt_off0000843d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843D 18308 bytes
SHA-256: 213ea0fed5678e19eff32fcc5d46e69a4f1b73f67043b57a178cf12547108d4a

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