Malicious PDF — malware analysis report

Static analysis result for SHA-256 329d8a28eda4b93d…

MALICIOUS

PDF

42.9 KB Created: 2020-08-14 03:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6381652d03a21616c19330853cdc2d7f SHA-1: 26baea02b5c9373da7d5647a7814cf8e43dfdc96 SHA-256: 329d8a28eda4b93d15fd405209e07ece150aa6754ceee9d21f257d18fe211b1d
120 Risk Score

Malware Insights

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

The PDF file contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=simplifying%20rational%20equations%20worksheet', which is also flagged as malicious. This suggests the document's primary purpose is to redirect users to malicious content by masquerading as a worksheet.

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.cc/wb?keyword=simplifying%20rational%20equations%20worksheet
    • http://ridevos.dsbcyouth.org/uploads/1/3/0/9/130968926/4606688.pdf
    • http://files.cedarcreeksculptures.com/uploads/1/3/0/8/130813841/4059053.pdf
    • http://dobaxad.nataliajezova.com/uploads/1/3/1/6/131607095/2042755.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/37470449445.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/rivumamikopumajokoze.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/zuwulejidakavitoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/7930/2296/files/finadedobelesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/leveganuvogimutofofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/83298598435.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/23023653369.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/gogezijufibirowefobexod.pdf
    • https://cdn.shopify.com/s/files/1/0437/9518/5824/files/d_d_hobgoblin_race.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/valoropowife.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3330/files/kumidewabifujo.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_off00005e9b.bin
d9ae3abca47635c94b07b84d1d44fe3230d573b13e7785a1d4012705f1d5ccbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5800 bytes
font_01_sfnt_off00007249.bin
2be8378506048381a151ee7220503434d3e5671f1e403f2bce9363c44400460b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7249 13972 bytes

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