Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf7f405808d7896…

MALICIOUS

PDF

34.5 KB Created: 2021-07-08 01:11:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1803e5653f8bb0dc7667cbb4d8fcd028 SHA-1: 7c8e21efa172bdda0ac126367a1e3909d3b0be79 SHA-256: ddf7f405808d7896c572896a5ba4f5561604dfc8cfdf4a1fe8960d8552cda674
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, likely to lure users into downloading further malware or engaging in scams. The document body and heuristics indicate a lure related to free game hacks and currency, which is a common social engineering tactic. No scripts were extracted from this sample, but the presence of malicious redirectors and the lure strongly suggest a phishing or malware distribution attempt.

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/spinuri-gratis-coin-master-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/gear-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-10-codes-for-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-no-human-verification-android_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-one-mill-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/1x1x1-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-look-awesome-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-avatar-customize-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-no-human-verification-no-offers_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/kazok-youtube-free-robux_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_off00003069.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3069 23120 bytes
SHA-256: c4f7170c4280de4ca2cf4ea90ca1ff78eca8976c0259cb7e6c7b4c1de2844a2f
font_01_sfnt_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 18152 bytes
SHA-256: a6076e1b303454bb30c70a8673d91eb0bd319a08e3fc25c4d679c7bcf2342b8b

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