Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31622d4995b4166…

MALICIOUS

PDF

46.1 KB Created: 2021-05-16 23:42:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1f81c5c89a57be7d50a9b7caba2f955b SHA-1: 6eac06e7f32b71385dc2931dc0cd54caf490decb SHA-256: d31622d4995b4166f72313ba66f2ab5a0b649fddd384f01a3329655bf419e6bd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of game hacks and free generators, redirecting to known malicious infrastructure. The document body and embedded links strongly suggest a phishing or scam attempt, likely to lead users to download further malware or engage in fraudulent activities. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/where-can-i-get-free-coins-for-coin-master-game-hack In PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-free-spins-link-today-new-2021_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_off00004e41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E41 25104 bytes
SHA-256: bd56f538f00feaa78609b646a13297b413e2ca8b8d75828a04fa4c8812443f9c
font_01_sfnt_off00008694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off0000927c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927C 18076 bytes
SHA-256: d5e6c6e53570627b424db4ca2759b6e9ac4bc686df616c28f2d32ec66339f87e

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