Malicious PDF — malware analysis report

Static analysis result for SHA-256 691415c4ddddd5e0…

MALICIOUS

PDF

43.5 KB Created: 2021-05-11 01:07:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e8c7a799e8d9d1e64b6945fa09c37f19 SHA-1: 86ada69fc293a39c907859440717a02250e4c1b3 SHA-256: 691415c4ddddd5e0befc642b4ba761365cdea7bb6e41144dbfbb98d576cd33f8
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external websites, masquerading as game hacks and generators. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document body and heuristics confirm the intent to drive traffic to these deceptive URLs, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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 https://netcdn.xyz/app/406889139/coin-master-hack-app-android-download-game-hack In PDF document text
    • http://stsbih.com.ba/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/getrobux-now_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://stsbih.com.ba/images/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-coins-coin-master-ios_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_off00004d4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D4C 25048 bytes
SHA-256: d149a462297b37b43cb8b47682a972f89d0a3dca141d29c607a924e9654e6cff
font_01_sfnt_off00008722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8722 18472 bytes
SHA-256: ce710c1ea70bd19d40b451a7d18c4a8a6d5bae3786b43e0834e6491f7024c8b0

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