Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd1987fc4394a00…

MALICIOUS

PDF

43.4 KB Created: 2021-06-04 06:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c6d78b78c2af3a918586e790c5e17625 SHA-1: 486374eee39821b97af2261bbacf7ff8a9a3f573 SHA-256: 3fd1987fc4394a001ef5360b82761f823ffeb23e47c2c0f4699c1317e1ba3480
220 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users into clicking on what appears to be a game hack or free spins generator. The primary URL leads to a malicious redirector that hosts a large number of other PDF documents, forming a link farm. This suggests a campaign to drive traffic to malicious sites, potentially for further exploitation or phishing.

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/406889139/all-links-for-free-spins-coin-master-game-hack In PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/pokemon-go-free-hack-apk_GM1094591345.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-spin-and-coin-link-app_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_off00004fdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDB 24452 bytes
SHA-256: 81355dabaa5b54c77806a4277db8222b7e7ff414254893dc94fb1c306f404df5
font_01_sfnt_off00008785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8785 18128 bytes
SHA-256: 044c53bac45d08d3f17c9b545fd6795d0ac3787584b11a8d468fb1cbfbbac23d

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