Malicious PDF — malware analysis report

Static analysis result for SHA-256 30894883af9c97e0…

MALICIOUS

PDF

43.7 KB Created: 2020-08-30 23:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b756f717d58c77a65cae78326025be90 SHA-1: 3e2c4c509b2e100bda5ecc3d23b95c383c81b6a8 SHA-256: 30894883af9c97e0b4be1b70f041414c98b6f2637d711d406474fef786d856eb
150 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=assassin%2527s+creed+brotherhood+free+download+for+pc+windows+10'. The document body, though heavily obfuscated, also contains this URL and references to 'assassin's creed brotherhood free download', indicating a lure for software downloads. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', suggests a link farm designed to improve search engine ranking for malicious content.

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.cc/wix?keyword=assassin%2527s+creed+brotherhood+free+download+for+pc+windows+10
    • https://static.usrfiles.com/ugd/b916f4_1fd11eb5f9604e968f906bc88922eb6e.pdf
    • https://static.usrfiles.com/ugd/3e5d97_109df2449f05424599808a7c288e6a92.pdf
    • https://static.usrfiles.com/ugd/269bb8_ba2dd016043341a3987dd6c1a2642f0a.pdf
    • https://static.usrfiles.com/ugd/cf14a4_4c3826d1bd4341feb44c946b6a5d14ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa2cf6b96ada42b1abdcefda0868898e.pdf
    • https://static.usrfiles.com/ugd/868401_8e20bcf310934a189c10d47ceacc7d50.pdf
    • https://static.usrfiles.com/ugd/9ec29b_6ab2f33abb504ee09427dfc0f52b7f3e.pdf
    • https://static.usrfiles.com/ugd/d5cf39_eb1f7bc4fdc0446d8a1cf425788c595f.pdf
    • https://static.usrfiles.com/ugd/f0f215_57960adb343c4895a6370d3f164ba22d.pdf
    • https://static.usrfiles.com/ugd/0f5b72_1019e07f6db841e2af6d7d20fd870225.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/semizixuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/25336465761.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/hc_04_bluetooth_module_datasheet.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/
    • https://static.usrfiles.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a3.bin
3fd0d68fc4182b39a55f34dc7e04319bd33a701c4c6fbe1bde671f54682d4406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A3 5692 bytes
font_01_sfnt_off00007c08.bin
14dcd49f3c7537f98c0710b22fb34c62f5d75a925a879abaa3c95098db60eb84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 10920 bytes

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