Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d0d7de569bc77e…

MALICIOUS

PDF

37.2 KB Created: 2021-05-21 20:03:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4bbcd97acb9f841d8c2e5607f1395aae SHA-1: 53ea121341eff45b8060e6ee48f67876f7ab6ad9 SHA-256: f9d0d7de569bc77e4d236c1a1bb465cd222e30b961d091616417169c88694ad5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks". The primary malicious URL identified is https://netcdn.xyz/app/431946152/robux-free-co-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/robux-free-co-game-hack In PDF document text
    • http://gomelavto.by/images/add-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/tiktok-free-view-iphone-join_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fdd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FDD 24708 bytes
SHA-256: 5eadffaf0ab6454f5c896b1cd4dc08312f553cdfa3167eb079716eaa0820412f
font_01_sfnt_off000068c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C9 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off0000746a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x746A 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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