Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e4f0aac2bac425…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 10:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a51e1b30d7958c7d3888a9a6331f5e6d SHA-1: e5aee5802ada6fd0fd19a5ec006b9553b42efab5 SHA-256: a4e4f0aac2bac4256b79db9b1cba2838dc65ec475e8211608048f3864ba400b2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a game walkthrough and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to the same domain, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=lego+dc+super+villains+walkthrough
    • https://static.usrfiles.com/ugd/b8c837_8afa378f9c414a4cad1c4fd2df8203d2.pdf
    • https://static.usrfiles.com/ugd/a18aa6_3445206d2c4b4576b9967d3aaa32b895.pdf
    • https://static.usrfiles.com/ugd/fb83f1_7ac195229a474688857aeba39fc8b5b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_46b1b7ad7be048c687227b99183eaa88.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/tadixo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/emotional_intelligence_test_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/audio_visual_aids_in_health_education.pdf
    • https://static.usrfiles.com/ugd/221f3a_5556043177954f179d222ece8cc6876f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0003321d600c4ca7967a273a0d5821d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_def380d5552e418d82c97d6d4a3e69fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_73c3feb5774a4625a0513c9c1c281488.pdf
    • https://static.usrfiles.com/ugd/eaf48f_1bfd4ebda3d14e98b3897012d763400d.pdf
    • https://static.usrfiles.com/ugd/5b5da7_08be4c569838461fb37ff12e1e67a248.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_off000069e1.bin
3d9b955c3a1dfa351db50f2b9a3e994e3323025ead42575a39175d7c2cf6fc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 5492 bytes
font_01_sfnt_off00007caa.bin
bac11a9b76e58fd406a206099f1cc05fa70f8c7dac134fa98b4d3ea85c555536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAA 10352 bytes

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