Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aba31c1de8ceb65…

MALICIOUS

PDF

39.4 KB Created: 2021-05-20 22:45:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8755685ef1e74a17052590b15bb22a4a SHA-1: 89ba22c1a2a613c222577b8861ac6b97667a4455 SHA-256: 6aba31c1de8ceb650ada261fee74712fa029982036e957e4b835129294f8510b
122 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it's a lure for a 'free generator / game hack' and impersonates PayPal, directing users to a suspicious URL. The presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely credential phishing or a download of a second-stage payload. No scripts were extracted, but the document body and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 5

  • 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.xyz/app/835599320/tiktok-free-like-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/835599320/tiktok-free-like-game-hack PDF link annotation
    • http://krumerhaus.at/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/tiktok-free-view-10_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-reward-link_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003231.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3231 27920 bytes
SHA-256: 952f48d5b3a3c588b2634833bbce0611d70ef469950b21d817aa1313b70930b5
font_01_sfnt_off00007156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7156 2892 bytes
SHA-256: 5e0712ca08337fb3b2e5736ec787a8b2ab1b9b6f3706f0b029d23afe08e6a7a6
font_02_sfnt_off00007b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3C 17456 bytes
SHA-256: ba884a245873681fcb5f05192b04ab87cd2c9026a3a4d64f61f82205aeb44e01

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