Malicious PDF — malware analysis report

Static analysis result for SHA-256 422eaaaa8fe66c2c…

MALICIOUS

PDF

36.3 KB Created: 2020-08-05 05:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b11cfb2576ab6905dd308e9b7992663a SHA-1: dc369752ff09a79b45c8df1ec364f5f7f9d3172b SHA-256: 422eaaaa8fe66c2cc8782915c0b5cdc9e0048e091fd544e0a03c441e5a8d2c80
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains text related to 'Acer aspire one zg5 disassembly manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous PDF links indicates a link farm designed for SEO manipulation or malware distribution.

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.com/wb?keyword=acer%20aspire%20one%20zg5%20disassembly%20manual
    • http://files.exploretravelplanners.com/uploads/1/3/2/7/132740361/00a13d3fa23.pdf
    • http://files.emermarymorris.com/uploads/1/3/2/8/132814958/254cedf32b.pdf
    • http://files.danstrings-and-more.com/uploads/1/3/0/7/130776363/9687138.pdf
    • http://delafusum.couhigpartners.com/uploads/1/3/1/6/131607062/9493304.pdf
    • https://cdn.shopify.com/s/files/1/0428/2987/3318/files/31444180862.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/rewojubokigedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0436/5231/7342/files/42430069557.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/baxajibevale.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/82701698701.pdf
    • https://cdn.shopify.com/s/files/1/0437/5743/7080/files/696982302.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/dojas.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/basic_discord_py_music_bot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5390/8117/files/35102107353.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_off00004d94.bin
207e4fc18d85d07aabd16da5aaf8c50e85a5b7919cd700fff142e491ee962655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D94 5796 bytes
font_01_sfnt_off00006153.bin
16decec8fe57699a6896c2830bb91874ce72f9a51bd0d916f5493d8aed427711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 10296 bytes

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