Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0374c372f708faa…

MALICIOUS

PDF

35.3 KB Created: 2020-08-25 16:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bb2139c11f12b493fe8ab7001e52a0 SHA-1: ba06563e8414b149f66a5d9841f252985cbfefe3 SHA-256: f0374c372f708faa49e79b34a3b1ca12fe68ada35db4dd43cb5a00c73f3e9a09
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to other sites. One of the primary links, https://ttraff.ru/pify?keyword=geometry+rotations+worksheet+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to academic worksheets, likely a lure to encourage clicks on 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.ru/pify?keyword=geometry+rotations+worksheet+pdf
    • http://files.shipleyartstudio.org/uploads/1/3/0/8/130873738/pirodi-purirexepo-sotubifav-wavilolujufuna.pdf
    • http://files.amandatriplett.com/uploads/1/3/2/6/132695915/7030463.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/aldosterona_funo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/31337280594.pdf
    • https://cdn.shopify.com/s/files/1/0439/4598/4158/files/liquidez_bancaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/xetabakosebakurexezozoxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1353/6925/files/kalaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/ret_pally_icy_veins.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/wikejoxukupozitovusewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/wotuj.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_off00004cbc.bin
0cd28de70ab0a500ed876d17c6c81fa01dcebf9559d0bdf3ce6e3587ab6b49f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBC 5536 bytes
font_01_sfnt_off00005f83.bin
420d17d5a8e07e2efdcca2cc10ebf134353b910a73241139da7ddc68159bf99d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 9692 bytes

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