Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4d3c33e2cec178…

MALICIOUS

PDF

36.2 KB Created: 2021-07-03 12:56:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d9640e49682303cbe474033b5498ceda SHA-1: 75dff6f1d3f1ba2853b9a1d1b5f70e7ef7f0d84f SHA-256: 9e4d3c33e2cec1781f13c786a00b1066bb3b29658d09f2d9f852146a94e2750c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains malformed streams and links to known malicious redirectors, specifically advertising 'free game hacks' and currency. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a lure for users seeking in-game advantages, likely leading to further malware or scams. No scripts were extracted, but the PDF structure itself is indicative of exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://netcdn.tw/app/431946152/free-roblox-money-game-hack In PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/roblox-sciprt-executors-free-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/cheat-jailbreak-rush-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/vermillion-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/bag-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/roblox-jailbreak-hack-2021-noclip_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/roblox-free-knives_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/download-dimond-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-get-free-robux-on-a-hp-laptop_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/robloxgiveaway-xyz-roblox-online-hack_GM431946152.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_002_off0000336e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336E 23788 bytes
SHA-256: 069054d47973fe3532a35949578efb748ffdfe02cc094031daba7ef9bc7a46ef
font_01_sfnt_off00006885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6885 19028 bytes
SHA-256: 286b45bdd8f766aa386658715904d42a258412499d5ccea6d2527f33b9debf2d

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