Malicious PDF — malware analysis report

Static analysis result for SHA-256 172fdf656e96a3c9…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 10:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c344fb48ed9aee8bc071c4e046dfca7 SHA-1: 5600c859c173fe1f76fca46f3213d10e2c044fa4 SHA-256: 172fdf656e96a3c9291d45359215de7899a247ab38464151a8bc978f6f627e01
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for "Android studio tutorialspoint pdf download" and embeds a link that redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests SEO poisoning to drive traffic to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=android+studio+tutorialspoint+pdf+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6908d7_9743e80c585e49189a036885f46a64b3.pdf
    • https://static.usrfiles.com/ugd/c5d40f_cf214b9295d94cad8002e31790d26e01.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b7f69f54454e3f9f877e93227c4a94.pdf
    • https://static.usrfiles.com/ugd/5e81b9_d6b156c6155147f8a7debf8ce6945818.pdf
    • https://static.usrfiles.com/ugd/2b3f46_0777bf4e917f425ca294b14f54ba771c.pdf
    • https://static.usrfiles.com/ugd/b8c837_95c02251716544b8ba687ac2450d4888.pdf
    • https://cdn.shopify.com/s/files/1/0435/7944/1307/files/gasagunojiduviwe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1229/files/baudrillard_simulacre_et_simulation.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5f7a0aaf34f9e8a31f1af57986d26.pdf
    • https://static.usrfiles.com/ugd/b91566_713d0b03df38496094761159d4d68111.pdf
    • https://static.usrfiles.com/ugd/b8c837_7471b1917eb94287b999ede0c3e7c742.pdf
    • https://static.usrfiles.com/ugd/07625c_f83cd31eed04453d81817d46404497c4.pdf
    • https://static.usrfiles.com/ugd/0bcf16_fa3da9ae2577466488764d25048d77e9.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006531.bin
bdacd61df1e24a4421e84edb4040bc46b8cc4409f6754fa154b68b6a95c7c977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6531 5116 bytes
font_01_sfnt_off000076b5.bin
5d9132b331914e808dfa2bbd2d0df39f77c75649413506808dc1fbc923088fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 9940 bytes

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