PDF malware analysis — malicious · 132995c551975722

MALICIOUS

PDF

42.3 KB Created: 2021-06-13 16:30:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 3a9064d3e619b724612b6a9b3a075152 SHA-1: 09cf6fb37a7b7e29e2909ff8fe0d80f92fa122a5 SHA-256: 132995c551975722db1619f7b886c1d92f7d99e3bb806f5ed6fe1d57045912a0

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a malformed stream and links to known malicious redirectors, impersonating brands like Facebook and Roblox to lure users. The document body and embedded URLs suggest a phishing or malware distribution attempt, likely related to game hacks or currency generators. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to trick users into clicking a link.

Machine Learning

Nyx PDF Classifier malicious score 0.9874

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.
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/roblox-4-free-codes-game-hack.
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 http://netcdn.co/app/431946152/roblox-4-free-codes-game-hack In PDF document text
- https://www.nara.org.uk/uploads/files/files/free-100-robux_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/free-robux-catalog_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/hack-dragon-ball-super-2-roblox_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/hacks-para-cb-ro-roblox_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/make-free-robux_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/roblox-hack-latest-version_GM431946152.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
- https://www.nara.org.uk/uploads/files/files/free-minecraft-gift-codes_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_off00004cac.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4CAC	23760 bytes
SHA-256: `f45c7957d80a326984860d949b3e4a74052b4bb498ebd48d9b1b9276c58f5bf1`
`font_01_sfnt_off000082ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x82AD	18184 bytes
SHA-256: `f702d1654960a15aa5607b6c298eb655eb46b683cffcfe48fc7a9a70a1472500`

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