PDF malware analysis — malicious · a84bc8e5eefd0ba4

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 08:59:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20

MD5: f4b9ded5e77a503ab45cbfe577f4d453 SHA-1: 4f663bb0a01465bbf71efda82c6b2dbb5c858d53 SHA-256: a84bc8e5eefd0ba41fb067d0feb27bddb39a754624e6a0cce331c806c0fcfcc0

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free in-game currency to trick users into clicking malicious links. The document contains numerous links to external websites, including a primary redirector URL, and a large number of links to other PDFs hosted on what appears to be a link farm. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/rewards-roblox-game-hack In PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/rbx-website_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/pokemon-go-free-team-change_GM1094591345.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/free-robux-working_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.journalofpracticenursing.co.uk/uploads/files/files/minecraft-pe-015-0-apk-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
`stream_004_off0000503c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x503C	25468 bytes
SHA-256: `e56cd47b54d1a2467fae1ff9cd9db51a0c6d01a7524d24367a8c82a6a5f5782d`
`font_01_sfnt_off00008b5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8B5C	18348 bytes
SHA-256: `e5759817fe9da731538361d676d13fdbb88e3f1994b931c5117a01ce845abe23`

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