PDF malware analysis — malicious · 77a43e7288424068

MALICIOUS

PDF

33.8 KB Created: 2021-07-08 05:37:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 926a7b557ca4f159a1bcdd8ada5b0ae0 SHA-1: 39d48492a8930f34fba1146c725abf8e215633c5 SHA-256: 77a43e7288424068a006f077c8d4c72883cef30a1bae0b0bef451ab1dd35a3a0

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-robux-game-hack. The document body and heuristics indicate a lure related to game hacks and generators, suggesting a phishing or malware distribution attempt. The presence of multiple external links, many with numeric slugs, points to a link farm strategy to obscure the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

Heuristics 5

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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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/how-to-robux-game-hack In PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/how-to-use-hacks-on-roblox-no-virus_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/minecraft-116-free_GM479516143.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/how-to-save-a-free-model-in-roblox_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-in-adopt-me_GM431946152.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/roblox-hack-client_GM431946152.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/what-is-a-free-robux-code_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/free-roebucks-com_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
- http://elearning.mtsamanahruteng.sch.id/__statics/gudangsoal/files/minecraft-marketplace-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
`stream_001_off00002c03.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2C03	23132 bytes
SHA-256: `a8733dd274391babc2f903830844f7280c95cb498844eeb0fa22c6d89474f657`
`font_01_sfnt_off00006062.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6062	18716 bytes
SHA-256: `81085473f4b1e3c22888fbcbdc36b36c4cbedeb7fb75c0ceb2fc7ec450597488`

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