PDF malware analysis — malicious · 2b81dcdc7df64de1

MALICIOUS

PDF

32.2 KB Created: 2021-07-21 05:50:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27

MD5: d627f926502bbccbe2b195b41f330268 SHA-1: 8889b2a73fb17218d7bf16146c71cdf38952332a SHA-256: 2b81dcdc7df64de1e8ed0aa0c036a1dcdf474064c94ff4eedb9ec87f9b3fc0fa

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks'. The primary redirector URL is http://netcdn.tw/app/431946152/buy-robux-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leveraging social engineering to trick users into visiting the malicious site.

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/431946152/buy-robux-free-game-hack In PDF document text
- https://magistrinfo.ru/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
- https://magistrinfo.ru/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
- https://magistrinfo.ru/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://magistrinfo.ru/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
- https://magistrinfo.ru/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
- https://magistrinfo.ru/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
- https://magistrinfo.ru/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
- https://magistrinfo.ru/images/free-tiktok-likes_GM835599320.pdfIn PDF document text
- https://magistrinfo.ru/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
- https://magistrinfo.ru/images/minecraft-font-free_GM479516143.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00002810.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2810	22956 bytes
SHA-256: `752aca429fc147e891eb57e6e7fcdbe952258ffd2177dead3df247065167de2d`
`font_01_sfnt_off00005b71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B71	18380 bytes
SHA-256: `476ede5eec74bc10ebccc5dfdd7d4cd59b191e9c851b862356eaa276b62fdd8b`

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