Malicious PDF — malware analysis report

Static analysis result for SHA-256 046cd5fbc8e7fd64…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 07:44:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c31a0e4b9cb7fc1dae9f08b811ce5341 SHA-1: 8e43708e816c1a86c32d2006be9bbd2d37873019 SHA-256: 046cd5fbc8e7fd64161f3f79145a779e55c741f6f0c219fa4f5419a8a8d39f7e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a malicious redirector disguised as a game hack generator, which in turn hosts a large number of SEO-optimized PDF links. This indicates a likely phishing or malware distribution campaign, leveraging social engineering to trick users into clicking through potentially harmful content. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or user interaction.

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/free-roblox-followers-generator-2021-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.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
stream_004_off00004fec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEC 24740 bytes
SHA-256: 502526535922ecbfdad4bdd9515dcde6e55a61e1577c1f604eb548963a8a9498
font_01_sfnt_off000088d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D4 18844 bytes
SHA-256: 227474e1735e5d7697922269f160fae01492720ac9d8b6c0a7f07948ae0c6b44

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