Malicious PDF — malware analysis report

Static analysis result for SHA-256 da83b3551485a52e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 14:34:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 94acd2a6737a4b95d0215dd19a2c40d9 SHA-1: 4e6d0685f4f4bd282df856bb2a86a1821db3dce8 SHA-256: da83b3551485a52eb7cf3d0f7dde74ed4dce57a01bb234ec036c5a73bf541977
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 0.9980

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 http://netcdn.tw/app/431946152/free-robux-kid-friendly-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/counter-blox-roblox-hax-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/cheat-roblox-knife-capsules_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-toys-codes-free-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-followers-and-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/pubg-uc-generator-without-verification_GM1330123889.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-t-shirt-on-sale_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
font_00_sfnt_off000030c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C0 23040 bytes
SHA-256: 1f41911f402b1887014fce02f82c37887209b972595f471cb514c7480073535e
font_01_sfnt_off0000644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 19264 bytes
SHA-256: f1cb0ea9790fd9eec1381d6ece3e0061b345793659c4b6d6641704be3ef20a74

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