Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbac934d03f9382d…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 08:45:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7da15be9f9f7021a2d771824567389a SHA-1: b3e499f06e505b65d2f42c87e577e355dabe0eff SHA-256: cbac934d03f9382d3a41ab09a65a65eaa958248a9e2b500ee3bb56407e0680ef
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical redirector URL, designed to lure users into clicking on promises of free game currency or hacks. The heuristic findings indicate this PDF is part of a link farm and uses a malicious redirector. While no scripts were explicitly extracted, the nature of the links suggests a potential for JavaScript execution or further payload delivery upon redirection.

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.tw/app/406889139/coin-master-free-pin-game-hack In PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-join-builders-club-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/robux-hack-online-cheat_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-robux-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-animations-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-gift-card-includes-free-virtual-item_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/como-hackear-roblox-para-tener-robux-gratis_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/create-a-roblox-account-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/donne-du-t-shirt-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-800-robux-for-free-nov-2021_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
stream_002_off0000331b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331B 24040 bytes
SHA-256: 36b8cdfc92086777b7f4a993cdc1f1404929b93c97c304396f572c799ccb1112
font_01_sfnt_off0000691a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691A 18152 bytes
SHA-256: dc9279c8f9ffb77b5b0b20899b1012281909b59fa7ee038540f0424ab4b7db6e

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