Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32acd359cf4d609…

MALICIOUS

PDF

40.0 KB Created: 2021-05-22 14:17:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a1752095403477400a43285d3a096f65 SHA-1: 36b70bd578f19810d2a57f55c7e58f23098ada2e SHA-256: b32acd359cf4d6090b864c707c7485c1bf02cb52c1de735d4e340a6dd0f83c91
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising a 'Coin Master Free Spins Blogspot' and a generator. The heuristic firings indicate the PDF is designed as a lure to a malicious redirector. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests an attempt to drive the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0134

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/coin-master-free-spins-blogspot-game-hack In 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_off00003302.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3302 30300 bytes
SHA-256: 89779d0c9746b8275f55a00126763caadad8f7d4ea9d152344f8e872138a599f
font_01_sfnt_off000070b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B5 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9F 18464 bytes
SHA-256: 7f13c81e41627db5de1fdc011b77043c9877b216986226f08b9acd2eded814ce

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