Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aefb0c68c9cb98d…

MALICIOUS

PDF

38.3 KB Created: 2021-05-21 15:13:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 43ea3d23d3d524464325a6d5c1d88763 SHA-1: f9e0dac746996e2fd88e0478b5ec44e7b261b6da SHA-256: 3aefb0c68c9cb98d515487c58561da765c979312a14868582f819c5fca231bc1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures for popular games like Roblox. The document body, though partially corrupted, contains text related to Roblox and a URL that matches the malicious redirector. The presence of embedded URLs and the nature of the lures strongly suggest a phishing or scam attempt, likely leading to a malicious website or a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7268

Heuristics 4

  • 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.
  • 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/roblox-help-free-robux-game-hack In PDF document text
    • http://klinkeridee.de/images/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://klinkeridee.de/images/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://klinkeridee.de/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://klinkeridee.de/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://klinkeridee.de/images/roblox-promo-codes-free-robux_GM431946152.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_off000031c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31C6 24600 bytes
SHA-256: 36a17cfb7a44d88efb1a57a51e80d9adbdaeeeb4941114c501318d0870ef090d
font_01_sfnt_off00006a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A81 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00007443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7443 18264 bytes
SHA-256: 4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127

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