PDF malware analysis — malicious · c24b319cb204f1d4

MALICIOUS

PDF

47.7 KB Created: 2021-06-04 02:53:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 3dde8ffa3a81ac2ae021942041520a05 SHA-1: 8fc10daa879af45a9531ff00d4cee7ad7d9ff8e2 SHA-256: c24b319cb204f1d405e400b3aed47a3cc2e814d19341968f6e5af9cbc38e0daa

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, including a known malicious redirector, under the guise of providing game hacks and free currency. The malformed stream length and ML classifier indicate exploitation, likely leading to the download of a second-stage payload via the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

Heuristics 6

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.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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.online/app/431946152/how-to-become-a-hacker-in-roblox-game-hack In PDF document text
- http://library.fikes.upnvj.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/roblox-ftw_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
- http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00004fcf.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4FCF	26548 bytes
SHA-256: `2b8b46c62559624be06a670b6134418b5673418c92eb581a6c8b32ed157a4867`
`font_01_sfnt_off00008cbd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CBD	2940 bytes
SHA-256: `ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb`
`font_02_sfnt_off000096cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x96CB	18608 bytes
SHA-256: `64431d83c1c466192ca6f90c953545fb4db60ca1c30fe2a26ad653d3315a559e`

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