Malicious PDF — malware analysis report

Static analysis result for SHA-256 c539b4cc3160a937…

MALICIOUS

PDF

50.4 KB Created: 2021-06-11 01:28:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 375bc3b85cb5f09a5bb6e4deebfe583f SHA-1: 6b24f4aa6f2071faef05497301e9c1d50e3fd211 SHA-256: c539b4cc3160a937e5d5e36d3784f11f46feaaa855e8315be195e3f18b8e1593
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appear to be game hacks and generators. These links redirect to malicious infrastructure, including a known redirector. The document body and embedded links suggest a phishing or scam attempt, likely distributed as a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.tw/app/431946152/jailbreak-roblox-free-money-generator-game-hack In PDF document text
    • https://miraller.com/upload/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/robux-for-offers_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/robux-converter_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/game-stealing-service-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005266.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5266 30196 bytes
SHA-256: 45adbc8ec335863d87b165eae45ebe30e272a5d611fdc5be9f2bd571a98831b5
font_01_sfnt_off00009681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9681 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000a02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA02F 19112 bytes
SHA-256: 52eb70af9d5f294d4ef567b08cdc4dee109a4827c2b2ecbbfd266c3021742a25

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