Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a38753c38c76d1…

MALICIOUS

PDF

41.0 KB Created: 2021-05-17 08:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2f1a65583ac9716d6fdfa427d4e385c8 SHA-1: c8a488670837f914cec6e850a93f2760d0ce4638 SHA-256: 13a38753c38c76d17edff108165f6b0c9a678a8b3aafb961d2e30c2aa2b77e5d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors, specifically advertising "game hacks" and "free robux", which are common lures for phishing and scam websites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/kachifpro-game-hack In PDF document text
    • http://tehergumi.hu/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://tehergumi.hu/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tehergumi.hu/images/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.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_003_off00004780.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4780 24624 bytes
SHA-256: 09d90e96fb31282c8fc27414eca2e70939153a20f01b38b1bbf103c5de42f5ac
font_01_sfnt_off00007f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9B 17784 bytes
SHA-256: f5f16e9fe06415f99f9f196ec79e922628d3dac9c37f6a7894d79eeb781dffd0

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