Malicious PDF — malware analysis report

Static analysis result for SHA-256 78931aa0f28315a4…

MALICIOUS

PDF

35.9 KB Created: 2021-06-18 04:48:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8195d99c63b5b6526b1d2424c5259809 SHA-1: aa680a98d1bab196354d4f3424a188b70e956e3b SHA-256: 78931aa0f28315a435473fa9f8ac5c235503880e2614dcb2048c46ea6c4b2808
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator' and 'game hack' lures. The document body and extracted URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-roblox-groups-game-hack In PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/is-there-free-robux_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/robux-xyz_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.tamimaudit.com/uploaded_files/userfiles/files/coin-master-hacks_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A9 22652 bytes
SHA-256: b4c3134c035f392ddb9e7206540bb3f5c6a84cb4b5a2bd48d13736b730ca3e7e
font_01_sfnt_off00006746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 19048 bytes
SHA-256: 919e41d2db0bd26eec910886965436d09f689b4eb5c4ed3ba396eb85dedd998d

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