Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbfa79db072577b…

MALICIOUS

PDF

48.1 KB Created: 2021-06-10 13:28:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e2a16b5c06392e24744d55e50cc455e5 SHA-1: 8f4c2abd0d3bc8f6b12baddcd7733ba2d5a6573c SHA-256: cdbfa79db072577b7c06ddaa4db804a7a47664cf6eb8a4789f36ad11f6e2259f
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into interacting with a malicious link, specifically `https://netcdn.tw/app/431946152/roblox-gold-chain-free-game-hack`. This link is identified as a known malicious redirector, likely leading to further malicious content or exploitation. The presence of multiple embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-gold-chain-free-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-dominus-rex-and-messor-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-exploit-2021-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/oginject-co_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-no-scam-no-password_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-robux-hack-tool-2021_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_004_off0000525d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525D 24688 bytes
SHA-256: 0e29ddbe2da8e32d01e9580751929820d2f7477d91e5cee9b4ad90ef7082a7fc
font_01_sfnt_off00008b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B77 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000981f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x981F 18636 bytes
SHA-256: b65b3bcf51e6da282bb71ae5d5d61cd20b02181281efb960c4357c75bbfe64a5

Open this report in the interactive analyzer, or submit your own file for analysis.