Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7fce87e85f791f…

MALICIOUS

PDF

34.1 KB Created: 2021-06-23 16:36:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 27f570645c4626a6c5c71d20c482544d SHA-1: 33a77c508e4baca88126d31c2882d36e25a7871b SHA-256: fa7fce87e85f791f710d161ddff7b68d658909bc058ca1eae3f0491433947128
260 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering 'free Robux' or game hacks, indicating a lure for users interested in these topics. The presence of a malicious redirector URL and a high ML classifier score strongly suggest malicious intent. The document body and heuristics point towards a phishing or scam campaign designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/431946152/how-to-get-free-robux-on-discord-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hacks-com_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/ahjefhz-roblox-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/money-cheats-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-how-to-get-unbanned-with-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-gift-card-redeem-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-25-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-do-i-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-apk_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
font_00_sfnt_off00002e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0A 22088 bytes
SHA-256: fc38d144da3f28e23d3f91b26ec280a05ffbf6481bf4823c4cd6bf669232c90a
font_01_sfnt_off00005ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF4 19444 bytes
SHA-256: f0aea1be72fee9447045aef7431be3ed932393e552e75c6bcb30a5ac73387a39