Malicious PDF — malware analysis report

Static analysis result for SHA-256 584e31a1e032eebe…

MALICIOUS

PDF

44.0 KB Created: 2020-09-08 22:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 022d2d318d9cd41267bb8fc045a69140 SHA-1: f7cd2e93ebbb6f63b49e2bdee10388ddc15d98fe SHA-256: 584e31a1e032eebed9267c6f45829188f5d6f9ac86c1779a8d1b4412dcadc11d
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of numerous external PDF links suggests a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=pleural+effusion+management+nice+guidelines
    • https://static.usrfiles.com/ugd/faa7ef_c84f38e5a4364f19a316196d1b8d0aa6.pdf
    • https://static.usrfiles.com/ugd/3bf302_5f68e7bce3504fc6a995547ecf1ff787.pdf
    • https://static.usrfiles.com/ugd/6a22cb_7f98156c032f413e8c4b4617132d980c.pdf
    • https://static.usrfiles.com/ugd/8e1900_b3f75d92f48047f6a3db38c6093ef2df.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/a_psalm_of_life.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/mofanabeweji.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/74037710567.pdf
    • https://cdn.shopify.com/s/files/1/0438/4151/9776/files/brush_up_your_english_grammar.pdf
    • https://static.usrfiles.com/ugd/197ed4_13a6c628b337480ab4416a21821648fb.pdf
    • https://static.usrfiles.com/ugd/2c76f4_fe4867d1d48646c984944e88110ff2dc.pdf
    • https://static.usrfiles.com/ugd/5be868_ace8ed183473404ca647cc7a1ab9d10a.pdf
    • https://static.usrfiles.com/ugd/f35da0_5f502059ae05430496c4b89e8e646cb0.pdf
    • https://static.usrfiles.com/ugd/49be48_ceb0c499d6ab461483ec3ecc35528c85.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_off00006988.bin
ba88a36b1e1d5a4e31391a60ecbac64a0393f19764c1e930fc480bc763051ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6988 5340 bytes
font_01_sfnt_off00007b9c.bin
4f546a950f02257c9d9162bf95113460e949eb84ec3879b4b5d6d65cad1e606e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9C 12480 bytes

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