PDF malware analysis — malicious · e41c980d6761c377

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 08:02:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 75313b387c74b45183c08f55008d73cd SHA-1: 4a74a848f01142bc2e9f95e831a5ac1cdec053ef SHA-256: e41c980d6761c37738b585458709adbabb4ae44232ad90118093ad9e5adcc701

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/how-to-get-free-robux-without-offers-game-hack. The document body and heuristics indicate a lure for 'free Robux' or game hacks, a common tactic for phishing or distributing further malware. The presence of multiple SEO-optimized PDF links suggests a link farm designed to drive traffic to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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-get-free-robux-without-offers-game-hack In PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-roblox-account-generator-old-accounts_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/roblox-sword-fight-on-the-heights-original-how-to-hack_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021-may_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/roblox-generator-com_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/buy-for-free-roblox-builders-club_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-make-account-for-intriga-roblox-hack_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-hack-roblox-no-download_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.indokashcrafts.com/uploaded_files/userfiles/files/minecraft-pe-free-download_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_off00003235.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3235	22208 bytes
SHA-256: `438b2b6224295d86cfa75dbb60f4df901024c5bca184ae0e5adfb0fbda7e4a3c`
`font_01_sfnt_off00006342.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6342	19468 bytes
SHA-256: `d293dc8b17a4ec261e56b386a82f7f63f23481516d807023c0ef4741d16fdc92`

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