Malicious PDF — malware analysis report

Static analysis result for SHA-256 6883381f63b5039e…

MALICIOUS

PDF

47.3 KB Created: 2020-07-22 11:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43641822834f4ba22237508fc0a9d329 SHA-1: 86cf5f89760e2a07508f061353463baf9c1ad3d8 SHA-256: 6883381f63b5039e61f481c1e24529019cafd4235cc8c2d578c84935e1c38961
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, https://ttraff.ru/wb?keyword=gravidez%20na%20adolescencia%20consequencias%20fisicas%20e%20psicologicas%20pdf, is a clear indicator of malicious intent. While no scripts were extracted, the sheer volume of links and the ML classifier's high confidence suggest a deliberate attempt to manipulate search results or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wb?keyword=gravidez%20na%20adolescencia%20consequencias%20fisicas%20e%20psicologicas%20pdf
    • http://files.cwaventura.com/uploads/1/3/1/4/131409761/kagugixuzudex.pdf
    • http://files.atticsalt.org/uploads/1/3/1/4/131437307/famirawipazupimuwu.pdf
    • http://files.thomashodgesmusic.com/uploads/1/3/0/8/130874352/7231953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/xanenen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9822/7353/files/79327432303.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/76914834932.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/59265328991.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0600/files/sikaditulinow.pdf
    • https://lonepeson.files.wordpress.com/2020/06/wonakamalal.pdf
    • https://juzomore.files.wordpress.com/2020/06/latosekuzepidobokameduzi.pdf
    • https://gejilopumuge.files.wordpress.com/2020/07/feboluluriwisenujekig.pdf
    • https://cdn.shopify.com/s/files/1/0440/0440/9494/files/52346308683.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/75173695483.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/14448279361.pdf
    • https://cdn.shopify.com/s/files/1/0433/9200/8357/files/lewezemozumibukufowoton.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/gurugaxewupizoseda.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/mapexogefazovukinofoloj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/bulanebexeluledikafotebur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.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_off00007585.bin
5194e978297396df38ce2836c8876c8f8302573af643cc6fd06704cbeb094813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 5392 bytes
font_01_sfnt_off000087f2.bin
29d73f6411be83adba536b954252769fd2cd202500d7be524546d35711acc2d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F2 12392 bytes

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