Malicious PDF — malware analysis report

Static analysis result for SHA-256 070fc3b5a9326dc6…

MALICIOUS

PDF

41.3 KB Created: 2021-05-11 03:50:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0873a40f7e2b30cacf26b6043246c70e SHA-1: 3a6b1d6e309a4f65cd09f6391527c87eb37e7140 SHA-256: 070fc3b5a9326dc612c7d7a679becdfd48bc2b521c88c2ba67bf7fe141e20533
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and domains, disguised as generators for popular games like Roblox and Coin Master. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support its malicious nature. The document's content and embedded URLs indicate a lure for users seeking in-game advantages, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-troll-outfits-free-game-hack In PDF document text
    • http://bestwig.de/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://bestwig.de/images/how-do-you-get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://bestwig.de/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://bestwig.de/images/robuxmatch-com-free-robux_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_003_off0000447a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x447A 25320 bytes
SHA-256: b773b5e0644eaf4f0d0f1bb2842c90668e5d77a5605233123b5ada8938e6c070
font_01_sfnt_off00007ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC4 18312 bytes
SHA-256: d7a6054ad6450820976bdf97a593247089bbc5ee73a255b9938ff1244ab0e13d

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