Malicious PDF — malware analysis report

Static analysis result for SHA-256 421c4a65070e1cc1…

MALICIOUS

PDF

47.1 KB Created: 2021-06-07 11:15:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dc31e9ba6b5e2fd38093952b8739b78a SHA-1: e9b595ffed38f5871dde9ac188b8b59ddc743339 SHA-256: 421c4a65070e1cc14de261033c0ca8f9477871d9bcc48fd864f4c50d85777a09
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and domains, disguised as game hacks and generators. The document body, though partially obfuscated, contains URLs that are also present in the extracted IOCs. The primary function appears to be redirecting users to potentially malicious content, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.
  • 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/counter-blox-roblox-offensive-hacks-skins-game-hack In PDF document text
    • http://nalmpantistractors.gr/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-simple-app_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-long-for-robux-hack-to-get_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-giver-real_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C9 28532 bytes
SHA-256: f70f20ebca340b93c3c15b7d4977a775c363f8c6dffb201bca855e027216f371
font_01_sfnt_off00009451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9451 18660 bytes
SHA-256: e6e708c5bccb30697a168889aa470c09f27f83ebcc9167f3744f0969498539f5

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