Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b0bd9a16021cea…

MALICIOUS

PDF

43.1 KB Created: 2021-05-16 18:12:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa96a4b546556cd96f3201da7f3ef1dc SHA-1: 49d2baf2c3ed5c707b5011008218908d8b9dab99 SHA-256: 81b0bd9a16021cea28524ffeb8072df6db5809692fd193cf102385e2fbf4e29f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector for a 'game hack'. The document body, though partially obfuscated, suggests a lure related to Minecraft and free generators. The presence of numerous external PDF links, some with numeric slugs, indicates a link farm tactic. The primary malicious URL is https://netcdn.xyz/app/479516143/minecraft-pocket-edition-hack-game-hack, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/minecraft-pocket-edition-hack-game-hack In PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-robux-codes_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_003_off00004d1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D1C 25580 bytes
SHA-256: ba092069ddda6d4ad7e15f22bd1be0728735e2acbf4dc387e7163e474baae179
font_01_sfnt_off0000868a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 18208 bytes
SHA-256: 8dadf0fd28e98d89ce6fd9d7956b131e74aedd91cd69dedc14cee10df05e92c0