Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb630f7368d9b65…

MALICIOUS

PDF

47.2 KB Created: 2021-05-14 17:40:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 43b8ab41dae033e03ba78050dffacae1 SHA-1: 80d3897fdcef36f00278880eb6688dcbdf8db46f SHA-256: cfb630f7368d9b655a924610881b267d9cef10167756a2bb769a0bf38351991c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The document body and embedded links suggest a social engineering tactic to trick users into visiting these sites, likely to download further malware or engage in scams. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/431946152/promo-code-free-robux-game-hack In PDF document text
    • http://dcmetroapp.com/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/roblox-rules_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/www-robux-redeem_GM431946152.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_off000048bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BF 29588 bytes
SHA-256: f484af95e3a85db2616f8ee2299d1b3b9c971dad18b77982f490d8512e59108b
font_01_sfnt_off00008bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC8 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9579 18604 bytes
SHA-256: fae8de94881284cdc44c9362006b897f1f4497b391b3b7f58f5f102f73a0fd89

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