Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb59cb3c08293f…

MALICIOUS

PDF

43.5 KB Created: 2021-05-13 18:04:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 58903a540bfd45592305e0d1cd80b8b9 SHA-1: b881b4966cf5ae4c7f34f81d0a748940c89b0663 SHA-256: 97cb59cb3c08293f967e9b9e40320a1b5dc30ddec19d5c1f4b82ab56c5ecd3c0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links designed to lure users into clicking on them by promising free game currency or hacks. These links redirect to known malicious infrastructure, specifically a redirector hosted at 'netcdn.xyz' and a large number of PDFs hosted on 'nalmpantistractors.gr'. The document body itself is heavily obfuscated and appears to contain junk data, but the presence of these lures and the malicious redirector strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/roblox-free-robux-com-game-hack In PDF document text
    • http://nalmpantistractors.gr/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-codes-generator-no-verification_GM431946152.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/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://nalmpantistractors.gr/images/minecraft-java-free-trial_GM479516143.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
font_00_sfnt_off00004843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4843 27580 bytes
SHA-256: c55187e61a7f0c11569206ee5e62516d4169b332818a0741e80637421711612f
font_01_sfnt_off000087bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BC 18348 bytes
SHA-256: ea71f63ad969ac354b647f6e6da4581b14ed625e24a3109b04dcf91fda1e68c2

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