Malicious PDF — malware analysis report

Static analysis result for SHA-256 df17be891e701e28…

MALICIOUS

PDF

39.3 KB Created: 2021-05-10 15:03:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9c4df05687ed2c99044d8db230fb35fc SHA-1: a4d5411b44d7e52e63d7a049409fc0decbc73481 SHA-256: df17be891e701e28ec89c965e1b2f318431f67fb4808bd3b18a96b82a1517fc7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and cheats. The document body and embedded links strongly suggest a lure to trick users into visiting these malicious sites. The presence of multiple PDF-specific heuristics related to malicious redirectors and lures indicates a high likelihood of this being a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/479516143/free-minecraft-maps-game-hack In PDF document text
    • http://alexandergroep.nl/images/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://alexandergroep.nl/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://alexandergroep.nl/images/weird-roblox_GM431946152.pdfIn PDF document text
    • http://alexandergroep.nl/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://alexandergroep.nl/images/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://alexandergroep.nl/images/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://alexandergroep.nl/images/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://alexandergroep.nl/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://alexandergroep.nl/images/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://alexandergroep.nl/images/coin-master-free-spins-only_GM406889139.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_003_off00003ef7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EF7 26140 bytes
SHA-256: fd3986dc3c5cca09083cda0906157f20f9c7414eee54ebd039ab49e3394b3921
font_01_sfnt_off0000799a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799A 17744 bytes
SHA-256: 642e76b92f67015eb87e7bb2f8978493590a3d76ebc6958dd5b149369a6bd5f2

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