Malicious PDF — malware analysis report

Static analysis result for SHA-256 078513f550f08c07…

MALICIOUS

PDF

54.4 KB Created: 2021-06-08 12:32:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 03ed4d2297b8f6b17c21fe68172b4668 SHA-1: 405616ccb22b8aaa347fa65e5e12f81744e8bd61 SHA-256: 078513f550f08c074ea2ce116ea2d04d2f573f6d36cbbf61bbd6fcfcdd03a257
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a social engineering attempt to trick users into visiting potentially harmful sites. The document body and embedded URLs suggest a lure for free game currency or hacks, likely leading to a phishing or malware download page. No scripts were extracted from this sample, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9499

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.tw/app/431946152/how-to-get-free-robux-no-hack-or-cheat-2021-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005440.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5440 28536 bytes
SHA-256: 230f26556cd4bff85c2adaa1b9a8a1d5d201f4833eb51dc75b49eb42c55cf523
font_01_sfnt_off0000953a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE7 6768 bytes
SHA-256: fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a
font_03_sfnt_off0000af26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 19248 bytes
SHA-256: 92c703c58c85fd83d67cafcf0a4b50639f5df26b6291f4046c94ea64a180bfd9

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