Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b30a9e14fee177…

MALICIOUS

PDF

37.2 KB Created: 2021-06-08 22:36:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 926b5c7139d54fa40a518605db1c36fd SHA-1: 0f342000c675faec1e7d6ab55f9b523c567b1993 SHA-256: b8b30a9e14fee17769bb524c17fc3f14fd39de62e9d448da797d7af32e5473e6
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains and SEO link farms, specifically targeting users interested in game hacks and free currency. The document body and heuristics indicate a lure for free Robux, which is a common tactic for phishing and malware distribution. The presence of numerous external links suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/how-to-get-free-robux-not-downloads-game-hack In PDF document text
    • http://gomelavto.by/images/roblox-bandit-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/offer-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C9 25336 bytes
SHA-256: 22eac3c5178caebb003fcbd9658f6f1e9142b140fb62cb112401a4d7a452993f

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