Malicious PDF — malware analysis report

Static analysis result for SHA-256 da24da548e99fa33…

MALICIOUS

PDF

39.2 KB Created: 2020-08-10 05:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54f3b8d4d2200d4e7ce1111e1c6069dd SHA-1: b99ce379320bb8fd189dd90377b2c3f24c49591b SHA-256: da24da548e99fa3315fa5ce3fd5121eff2ded8a4312f55402e5e9a850a03d2d2
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link farm and a specific malicious redirector URL, indicating a likely phishing or malware distribution attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK firing directly supports this, pointing to the URL https://ttraff.cc/pify?keyword=c%25C3%25A1ch+x%25C3%25B3a+1+trang+pdf+trong+foxit+reader. The presence of numerous other PDF links suggests a broader campaign to distribute malicious content.

Heuristics 4

  • 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://ttraff.cc/pify?keyword=c%25C3%25A1ch+x%25C3%25B3a+1+trang+pdf+trong+foxit+reader
    • http://files.loveandmercyfdc.com/uploads/1/3/1/8/131857071/tazowirujuvimi.pdf
    • http://kinipotu.thadwester.com/uploads/1/3/0/8/130874284/ec35f6714.pdf
    • http://rupodil.smartintegratedsolutions.co.uk/uploads/1/3/2/3/132302921/fonufuzaxowi.pdf
    • http://files.chesygn.co.uk/uploads/1/3/2/8/132815791/pubimem.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/83822480184.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/job_batch_and_mass_production.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/xalogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/56083039968.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/48675662386.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/sql_server_2020_management_studio_express_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/jojutekebumufavomalilowe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/42224271014.pdf
    • https://cdn.shopify.com/s/files/1/0436/9625/9240/files/ggplot_angle_axis_labels.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059b7.bin
f621ee5c1c8c9c965d91de58d9efd3a8616dc5ab16bfec9de309402d86f2976a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B7 5600 bytes
font_01_sfnt_off00006bf5.bin
1d97673014efef8ae8f6fb6490609824d3502f826b4a935c5f8d2b3e2559f118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 10160 bytes

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