Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729817d7a8e5ed5…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 04:56:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b496bec23adc2c2ad62793218d9a69ff SHA-1: 6a1f853610ef018d7ab019a705f547eb260304e4 SHA-256: 1729817d7a8e5ed54cdd1d2caeb01e1809a9f5f70c9514d3dfa607a9563eeab3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-free-draw-2-alpha-game-hack PDF link annotation
    • http://alroglobal.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/roblox-counter-blox-spin-bot-hack_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/tiktok-free-wala-video_GM835599320.pdfIn PDF document text
    • http://alroglobal.com/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://alroglobal.com/images/how-to-have-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://alroglobal.com/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://alroglobal.com/images/free-roblox-promo-codes-2021-december_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://alroglobal.com/images/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://alroglobal.com/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://alroglobal.com/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://alroglobal.com/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://alroglobal.com/images/you-promised-my-son-free-robux_GM431946152.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_004_off000050be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BE 26520 bytes
SHA-256: c6b552e538c43811004bbd7b8fcb7c461f0559050f8775db3d8bac6a21751079
font_01_sfnt_off00008cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD5 18972 bytes
SHA-256: d4eef894d5dd36f14fb503fdcddaa7d2e67f413d4198bddff4b8c09a3d2beeaf

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