Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c652f2a06887765…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 07:02:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fa5867a4ebb48e6dedef85a956c85945 SHA-1: e0f41fd2489d304ce95c5066b65ca6dd19922fd4 SHA-256: 3c652f2a0688776579f90e8a69f006b33ad0d38391e034ac2c57ef39e9eb66a6
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/406889139/2021-free-spins-coin-master-game-hack PDF link annotation
    • https://www.efeskbb.com/upload/content/files/is-bloxburg-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-how-to-hack-any-game-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-cheat-engine-god-mode_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/download-hack-roblox-cb-ro_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-no-surey-for-kids_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-no-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-free-promo-codes-vrp-madness_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_002_off00002ff9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF9 23020 bytes
SHA-256: 2fa36a56284977274530d933b760b32aa58c17b0ecad6464d43222946f479fea
font_01_sfnt_off000063ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 18576 bytes
SHA-256: e072abe3ddea7348b6ad42f3e58cf0336d8cc97c01862fb082958ccb0059bec3

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