Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4807b1733b587a…

MALICIOUS

PDF

41.7 KB Created: 2021-05-13 23:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cd615a259eb455c9c3c928192ce9c352 SHA-1: a054b2ecbf4b7935369cf0c7c95bce19ad6e6141 SHA-256: 2f4807b1733b587aef73716cf7fd03e544b7070f587564995580a79e339b1526
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game items, a common social engineering tactic. The presence of a 'password-protected archive' lure suggests the document is intended to conceal a malicious payload, likely delivered via the embedded URLs. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-minecraft-skin-packs-game-hack In PDF document text
    • http://centr-expert.su/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-game_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/is-minecraft-free-on-ps4_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
stream_003_off000049ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FF 25008 bytes
SHA-256: ca05c4d83dd67f64612b82ddd4fd1e05e67e2920b3a6542e57908e6fc894c490
font_01_sfnt_off000081f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F3 17892 bytes
SHA-256: 3d88f62d7f103248f07683485ae665a8ae7a7912bf87b287aa517b4ed8ad8cc7

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