Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb3250462c253c0…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 15:33:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b7e77d30bb19517ee3fbfc6412519f1f SHA-1: b097f8c088f04bbb77c953c547caf8e223d71fbf SHA-256: 6fb3250462c253c09147be85bf55e626af569c81bfedb43e344bac1c231ff864
160 Risk Score

Malware Insights

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

The PDF contains links to a known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Coin Master and Roblox. The document body and embedded URLs reinforce this lure, directing users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in game cheats to lead them to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-attack-link-game-hack In PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-free-emotes-list_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-codes-for-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-roblox-video_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-free-avtar-makers_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-codes-september-2021_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/builders-club-roblox-fre_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/infinite-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-roblox-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_off00003297.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3297 22692 bytes
SHA-256: 651cb08b94012b7f7ca81dedd4e978e42ab9f3134bcffecf2a12d14b28f33b1e
font_01_sfnt_off00006565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 18168 bytes
SHA-256: 75c6e626bf291d9515ad923a84f4b1e9b9d7c6cab114e50afbb6b6b9866eb8df

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