Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a619b88df08b300…

MALICIOUS

PDF

42.0 KB Created: 2021-04-25 17:32:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 53badd6a6e3a35b14ff492140cf50b4d SHA-1: d385ca2c0874418767d7a57aa6581d6257ae51dd SHA-256: 4a619b88df08b30085ca4077a9542b9006c9ace80f2dc3b0ae945dba5b12f7e6
208 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs brand impersonation (Amazon) and urgency lures to entice users to click on a malicious link. The link leads to a redirector that ultimately points to a 'game hack' generator, a common lure for credential phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/tampermonkey-roblox-hack-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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
  • 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/tampermonkey-roblox-hack-game-hack In PDF document text
    • http://www.drent.se/images/hack-for-freeeeeeeeeeeeee-robux-2021.pdfIn PDF document text
    • http://www.drent.se/images/restaurant-tycoon-roblox-hack.pdfIn PDF document text
    • http://www.drent.se/images/can-you-give-me-free-robux.pdfIn PDF document text
    • http://www.drent.se/images/how-do-you-hack-your-friend-on-roblox.pdfIn PDF document text
    • http://www.drent.se/images/robux-money-for-free.pdfIn PDF document text
    • http://www.drent.se/images/roblox-free-packages-download.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-email-verification.pdfIn PDF document text
    • http://www.drent.se/images/free-codes-for-roblox-live-now.pdfIn PDF document text
    • http://www.drent.se/images/how-to-hack-robux.pdfIn PDF document text
    • http://www.drent.se/images/hacks-for-free-animations-roblox-proof.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004089.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4089 28604 bytes
SHA-256: 412c6be7a6f5a89db8ab8c3eb2b728a871504ca3e595fabfc0552d0ca17d8de7
font_01_sfnt_off000080d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D4 18796 bytes
SHA-256: 33340312812277ccf76f5fd946dfbf5d3229261b23ccfbd48e95d6659a6e5ff0

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