Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f8f87f9111b78…

MALICIOUS

PDF

47.5 KB Created: 2021-06-09 03:21:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8fe5f4dacaeb05a4abceab50d5441a81 SHA-1: 2d9c01bc9205ef9c5a77271d97c556c26b475cd5 SHA-256: 0a3f8f87f9111b78176e34113d1219bf44f1d86cce8d31c30d89129eca3c8ef9
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 0.9769

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/406889139/free-spins-for-coin-master-game-hack PDF link annotation
    • http://demenagementlandry.com/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-robux_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000503f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503F 26908 bytes
SHA-256: ad911467ac0961d6c5eb14addfd4502c2c7e8170da4b3f0a6b876c5ba8be4d21
font_01_sfnt_off00008e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000981b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 17884 bytes
SHA-256: 7a686c540965cac69e1923dfbb6a78ce3f92ec60dbbf6836da21cbb58cd4d6cc

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