Malicious PDF — malware analysis report

Static analysis result for SHA-256 454c57fd220b305f…

MALICIOUS

PDF

46.4 KB Created: 2020-09-08 12:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7ec0810ce36b38ee46a7f8224228fb4 SHA-1: b45492824804b7c8ca26c085903dde88e2c7840a SHA-256: 454c57fd220b305f0fa4663696bc2b9417cd7bd41ab25a09770a1603283512ac
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to its inclusion of a link farm containing numerous external PDF links. One of these links, https://ttraff.me/pify?keyword=diferen%25C3%25A7a+entre+infec%25C3%25A7%25C3%25A3o+bacteriana+e+viral+pdf, points to known malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to be a lure related to medical information, likely intended to trick users into clicking the malicious links.

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/pify?keyword=diferen%25C3%25A7a+entre+infec%25C3%25A7%25C3%25A3o+bacteriana+e+viral+pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/phonetic_alphabet_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/sogopinutalevefusopaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/retonumozow.pdf
    • https://static.usrfiles.com/ugd/185811_8839bc84159c40ba815d24c19c01fbb1.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_b4874ddc82a140f7add223092f923049.pdf
    • https://static.usrfiles.com/ugd/b8c837_78da9fabcc9d4a2cb9a8509cdee0d3bb.pdf
    • https://static.usrfiles.com/ugd/f55bec_a8ecb4b31310445b9c583198b18687c9.pdf
    • https://cdn.shopify.com/s/files/1/0436/8593/7307/files/panovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/84877572528.pdf
    • https://cdn.shopify.com/s/files/1/0440/8918/0310/files/xebebufafudafoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/basicity_of_amines.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_off0000718f.bin
e8153307e9a5ede5c89f2d22648147dd0ede60b3ebabe1eb253df79b443f51a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 5668 bytes
font_01_sfnt_off00008416.bin
e532b531cc2ea32e3bc9a6825eb10c3d880eca0522afb98fd09171126b7ff28c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8416 13024 bytes

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