Malicious PDF — malware analysis report

Static analysis result for SHA-256 26157bed5b367001…

MALICIOUS

PDF

38.8 KB Created: 2021-05-23 03:42:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 39b0adeb5a7559980fcff60103db9958 SHA-1: 4c4d6b1e7ae5c28079220082af4431e4ec97e92a SHA-256: 26157bed5b367001071f37205ad42adea2fd83a7c1c06de2d5e3fdf2664d6484
162 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 and a fake-CAPTCHA lure. The file 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 0.8060

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/how-to-get-free-robux-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.xyz/app/431946152/how-to-get-free-robux-game-hack PDF link annotation
    • http://biotronics.com.cy/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://biotronics.com.cy/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://biotronics.com.cy/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://biotronics.com.cy/images/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://biotronics.com.cy/images/coin-master-twitter_GM406889139.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_002_off0000331c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331C 24976 bytes
SHA-256: 062dd074d2f726f8f5cd8fc50b4b5981dba5e30ac2b1a8b4dba3ad9b237abdb5
font_01_sfnt_off00006c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C60 2888 bytes
SHA-256: dcdd98ee8e25436a83587ccb4027347dd2c3fcec95f3413942edd4086125bcca
font_02_sfnt_off00007634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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