Malicious PDF — malware analysis report

Static analysis result for SHA-256 2221f5f6170f6ab2…

MALICIOUS

PDF

66.6 KB Created: 2020-09-11 02:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0de48dea7824b61a9c3e3874e19f5ef SHA-1: 432991708052f6fbd195765e59383a6c4dfd6de9 SHA-256: 2221f5f6170f6ab27c5a261f4a1936345e5c3573a6d77341aa0bb3ca98edb052
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=area+of+rectangles+and+triangles+worksheet+pdf'. This URL is likely used to redirect the user to a malicious site for phishing or malware delivery. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic to increase visibility.

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.me/wix?keyword=area+of+rectangles+and+triangles+worksheet+pdf
    • https://static.usrfiles.com/ugd/ea2f88_b96d200c6ed4484989c61a8008aa9407.pdf
    • https://static.usrfiles.com/ugd/6a4619_55af8fa67b044cc7b1321e7e654bfd64.pdf
    • https://static.usrfiles.com/ugd/a2d007_0d436ece37c64a21a337709331e72f29.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_27c84093c2b34878814aa82796ea102b.pdf
    • https://static.usrfiles.com/ugd/837d34_51dcea067c974d5281d8b668794f295b.pdf
    • https://static.usrfiles.com/ugd/3e9e83_fb565b4fa0dd4b30952c9633207dc977.pdf
    • https://static.usrfiles.com/ugd/0049ca_ee43affb749d4c859f696b49434ff63c.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/jirilemowoxijitipekovup.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/komuneminazomaxobugebuvom.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_436d206cf3984f4ca148564e28bf05ec.pdf
    • https://static.usrfiles.com/ugd/9219f8_ae4bb2e1487e4059af25b49f55a31ba4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5f.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 2828 bytes
font_01_sfnt_off0000c559.bin
9f65aef4e2019b4e66a19b6e862e09901b9d57f48b82ebc84a069a70f4befede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 5564 bytes
font_02_sfnt_off0000d853.bin
2610a12fe5eb0e9d7b4a10f08166a2e950034b76f977334547ecd2e39be64670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 10328 bytes

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