PDF malware analysis — malicious · b7fa0dc2a421a372

MALICIOUS

PDF

34.7 KB Created: 2021-06-26 23:39:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27

MD5: b95f443b549be3545310403ca31ea2c2 SHA-1: bf9da30a5a8bb1a7dac60fbb1e4c9a3456d777e5 SHA-256: b7fa0dc2a421a372274ed79a5a99a197b10302b59ec63d83b0c2bc37a4efb3f8

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file contains multiple links to external websites, including a primary link to a malicious redirector disguised as a 'free generator' or 'game hack'. The document body and heuristics indicate a lure for free game currency, impersonating brands like Facebook, and likely leading to credential phishing or further malicious content. The presence of numerous SEO-optimized PDF links suggests a link farm designed to attract users searching for cheats or free items.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.
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/claim-free-robux-button-no-human-verification-game-hack.
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/claim-free-robux-button-no-human-verification-game-hack In PDF document text
- http://lib.untad.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
- http://lib.untad.ac.id/repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
- http://lib.untad.ac.id//repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
- http://lib.untad.ac.id//repository/pokemon-go-free-85_GM1094591345.pdfIn PDF document text
- http://lib.untad.ac.id/repository/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
- http://lib.untad.ac.id//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id//repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
- http://lib.untad.ac.id/repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
- http://lib.untad.ac.id/repository/free-money-adopt-me-roblox_GM431946152.pdfIn PDF document text
- http://lib.untad.ac.id/repository/free-roblox-promo-codes-march-21-2021-twitter_GM431946152.pdfIn PDF document text
- http://lib.untad.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id/repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
- http://lib.untad.ac.id//repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
- http://lib.untad.ac.id/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
- http://lib.untad.ac.id//repository/minecraft-cracked-client_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_off00003023.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3023	22372 bytes
SHA-256: `3dc6d992692ba858805492114996f78a32f5469c5a6df6df105144d78cd0af0d`
`font_01_sfnt_off000061cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61CD	19408 bytes
SHA-256: `ed1568dfd09f4e6734d7d2cdb28f25fa54f0ee180fb66c77c9432327f8d96333`

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