Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cec47d4c9e12e1…

MALICIOUS

PDF

32.7 KB Created: 2021-07-19 16:10:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9ce10f96930a1105893335aaa10917e2 SHA-1: a7a98c079cdc5a057460de0bfc293bed48a17771 SHA-256: 35cec47d4c9e12e1644d23624dd45f83ec7b836709e211f50f72a1b949588cd9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as offers for free game hacks and views. The document body and embedded links promote these lures, aiming to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.tw/app/835599320/free-tiktok-views-game-hack In PDF document text
    • https://www.contabilidadesomma.com.br/images/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://www.contabilidadesomma.com.br/images/roblox-hacks-2021_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
font_00_sfnt_off00002d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9D 22412 bytes
SHA-256: a9ab8bc981e4b066e48e449ba5acb59f5386a967447e54d52e98676e7ac72ec3
font_01_sfnt_off00005f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5B 17752 bytes
SHA-256: fbbed6aa406878393a00abdc0937322fa009c5b8448fdc35bdb3145f27770f26

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