Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb1e8ecfdb040b…

MALICIOUS

PDF

42.0 KB Created: 2021-05-20 00:14:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4e5a20ff6e5d1fe7ed5806f315084377 SHA-1: 3f328e362e647d3b8d01e1d721b04cc308bfd066 SHA-256: 8fcb1e8ecfdb040b85944bc074ef3101d701890e90eb189e922c958c0de4f702
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, disguised as game hack generators. The document body and heuristics indicate a lure for free game currency, likely to lead users to malicious sites or download further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/how-to-get-free-spins-on-coin-master-android-game-hack In PDF document text
    • https://proviant.kz/images/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://proviant.kz/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://proviant.kz/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://proviant.kz/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://proviant.kz/images/get-more-robux_GM431946152.pdfIn PDF document text
    • https://proviant.kz/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://proviant.kz/images/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://proviant.kz/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://proviant.kz/images/roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://proviant.kz/images/how-to-get-free-chest-in-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_off000049f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F5 24620 bytes
SHA-256: a97ff5ece1d4e3587a3dac3bb24b48f8899224b8c66f683e4811c332ceba8028
font_01_sfnt_off000081fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FD 18224 bytes
SHA-256: e75a85775560c8380404af7b38c0f71a56f3669257afdef98786fb98fd154819

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