Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daa60c702ee36a7…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 17:35:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d2d8552d73dba9d612f5ea309b7e262 SHA-1: 490c6671f75ed3174b761b0b7307712c8f7cb512 SHA-256: 1daa60c702ee36a7556a9643f6039d96cff861dfa6b17fbd6d94160ef5168e13
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9865

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/rc7-roblox-hack-game-hack.
  • 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/rc7-roblox-hack-game-hack PDF link annotation
    • http://nalmpantistractors.gr/images/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/command-to-give-u-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/client-hack-roblox-2021-download_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/roblox-2021-hack_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_off000051df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DF 25784 bytes
SHA-256: a258b01f16c390f3a7928f674a407c85c959517b2a060db59f23e7010bf992d2
font_01_sfnt_off00008de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE6 18236 bytes
SHA-256: 13587d2cf695f0bf5dfd8d7db9b7d6c3c1e0254be20b59850132de4b9a413931

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