Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfefe9736f4ba00b…

MALICIOUS

PDF

35.5 KB Created: 2021-06-29 18:23:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1d4639efb3c9c8abd68c9bbadd207afb SHA-1: aa7e05aa3bed577874e1e24f306722e7ae96fe5d SHA-256: bfefe9736f4ba00b982435fcb2022d1e5f0da94716cfbeb9eb50beb6612c46b8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and currency to trick users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, including the primary URL http://netcdn.co/app/431946152/hack-roblox-lumber-tycoon-2-2021-game-hack, which is associated with malicious redirector infrastructure. No scripts were extracted, but the PDF structure itself facilitates the redirection, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hack-roblox-lumber-tycoon-2-2021-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-online-hack-for-free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/como-conseguir-robux-gratis-2021-real-sin-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/someone-hacked-my-account-roblox-how-to-get-robux-back_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-with-cheat-engine-65_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-and-tix-no-download-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-boku-no-roblox-remastered-hack-proxo_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-group-funds_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-wings-codes-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-cheat-codes-mad-city_GM431946152.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.

FilenameKindSourceSize
font_00_sfnt_off00003282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3282 22320 bytes
SHA-256: f5bdc88ed1913d839eb940395dc0d69bf6dbe0ad71aa8b39d0f38ff0ade8bb95
font_01_sfnt_off000063ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 19640 bytes
SHA-256: a472609c6867e993024b5165c272a4a7597c21b27f4208c3e7c18744a4eccc03

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