Malicious PDF — malware analysis report

Static analysis result for SHA-256 3414ae6cc0e7ecaf…

MALICIOUS

PDF

34.6 KB Created: 2020-10-03 14:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 283ed2142ffb1d8c2087f5da79b37b18 SHA-1: 9b4f4822523c749cee6698c2acc370a536440ab2 SHA-256: 3414ae6cc0e7ecafd15a8023cccc235a8c0d8fe2c4d0d487e691c08a4d31bfb1
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains URLs that are likely part of a link farm designed to obscure the ultimate destination and potentially evade detection. The presence of embedded URLs and the redirector link suggest an attempt to lure the user to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=test+de+autodiagnostico+del+emprendedor+pdf In PDF document text
    • http://files.projectcaleb.org/uploads/1/3/0/8/130873718/1711342.pdfIn PDF document text
    • http://kuvizonuw.emilyervinphotography.com/uploads/1/3/1/4/131407630/dekejoxadu.pdfIn PDF document text
    • http://files.newtonwonder.net/uploads/1/3/1/1/131164168/0f4dd639f8b50.pdfIn PDF document text
    • http://files.katyjunkremoval.com/uploads/1/3/0/8/130874524/ganetisifimibut.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/vorenirupusamesudabula.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/23552488056.pdfIn PDF document text
    • https://site-1039564.mozfiles.com/files/1039564/43986669121.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/28815642539.pdfIn PDF document text
    • https://site-1042276.mozfiles.com/files/1042276/98991816597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/cedar_street_harmony_crossbody_pink.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5131/4083/files/tuning_a_violin_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/zoresedazofavisam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab75ed7f-91cb-4d8f-8c6a-ca0bae499f0f/53498592812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18962fe9-1c55-419a-b9e3-ff7e2dccc2b6/35074224512.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46D1 5424 bytes
SHA-256: bafa50fe0c53a1e69bc1792f6142489e52cfef55042cce3ec5f7fe4fe1da2877
font_01_sfnt_off0000592d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592D 10708 bytes
SHA-256: 7d133114f6166a02bc2c9245e15bdb29e5a69dcfdba5e67691f79d200533c4f4

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