Malicious PDF — malware analysis report

Static analysis result for SHA-256 321ab032a3c2b9ef…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 08:44:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b443aef0ec2cdf97b3d00060006c55fe SHA-1: ab49d1d5a30133abe7393d757ce9cbbec2dfac8a SHA-256: 321ab032a3c2b9ef9ce82cff8bbb38ec1b5b59bcb411a02d8f718c258fde0d02
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing tactics to trick users into clicking links related to game hacks and free currency. It contains numerous links to SEO-optimized PDF files and a primary redirector URL, indicating a campaign to drive traffic to potentially malicious sites. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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-spin-codes-game-hack In PDF document text
    • https://au-ma.com/image/data/files/roblox-bloxburg-hacks-instruction-and-screenshots_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-ro-citizends-hacks_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-ios-no-human-verification_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/john-doe-roblox-hacke_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-robux-in-roblox-for-free-on-pc_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/thanos-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/best-jailbreak-hacks-for-roblox-ooooof_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/booga-booga-roblox-hack-code_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_off00003239.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3239 22892 bytes
SHA-256: 931c3621560898d10ebc007925355b1a0bdafad6bacd8a1eafb82d18d029f29c
font_01_sfnt_off000065c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 18348 bytes
SHA-256: 9e9c4f8be19f0ad0d41979f724cf6b1bf7467f7e43e4e9071540c80937701c51

Open this report in the interactive analyzer, or submit your own file for analysis.