Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e727baf7dc42d84…

MALICIOUS

PDF

41.8 KB Created: 2020-09-01 12:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e709e1bd8eb1188f06962f4b611069 SHA-1: 0d749c0e9958ab4b1b7372dea1deb6298361dfa0 SHA-256: 1e727baf7dc42d8466036d2c3300460dfcc561701830c84dca5ada6fe89ad1ce
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to benign content farms, but one critical link directs to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site disguised as educational 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.ru/wix?keyword=tracing+capital+letters+worksheets+pdf
    • https://static.usrfiles.com/ugd/1decf9_16f3734f5ac54c5b9e44709b168b39db.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c693b2f74a84c5d82f66b5838e8335d.pdf
    • https://static.usrfiles.com/ugd/b8c837_01997eb66f384cb2b5483b4ff4489c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb372ff0ee1348b0aebb87c1f0f29cec.pdf
    • https://static.usrfiles.com/ugd/625844_4355fe14877f47cdb676e5de15dcc7c4.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/wijepuramol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/psicologia_del_aprendizaje_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/wudujedemijabebib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/vatikerarutonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/78037513355.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/nenogudarewodimupofike.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/jeburizojezipu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/25513121004.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8234/files/buzatixelebinomunudefa.pdf
    • https://cdn.shopify.com/s/files/1/0441/0025/5896/files/sasabibarazadurif.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/islamic_banking_in_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/49067866947.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_off00005dcf.bin
19bf49a416923a22721616f1177e161302bcd587202852c6682cef41f9ae1d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCF 5524 bytes
font_01_sfnt_off0000709e.bin
985ea09e594ac4ef6a7866c4fb2567abe06efee46a77af0171f823f0e6672280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 13288 bytes

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