Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa87878c2654e40d…

MALICIOUS

PDF

67.1 KB Created: 2020-12-01 08:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b351530a5a9181058a5ab03337e82001 SHA-1: e1cf2c2dceb0a2ac6b42f9eeba2b46bfc03631e8 SHA-256: aa87878c2654e40d0fb5fa132c929eba119e9bd7c8d997391e3a55527fa934a3
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as a malicious redirector and for containing a link farm. The embedded URL 'https://traffine.ru/aws?utm_term=android+show+snackbar+above+view' is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=android+show+snackbar+above+view In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_5f9f40ef1683d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5fad3c300239f.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/520dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_5fa8d1a5af6f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fc147c53c02f22b9d3c3a4e/1606502342791/top_10_bollywood_songs_of_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/4190543311.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/bingo_card_template_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/oem_johnson_evinrude_fuel_line_assembly.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06ecff7cf8c75402886b4/t/5fc0f04da97599144e192a5e/1606479950897/33076119836.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe08183570fb44d1ca3a3c/1606289433823/kosakorip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a11cfb6-b4cf-43b5-8cad-e3d0d7d01e06/accounting_principles_weygandt_13th.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ebb3c02f22b9d04e48e/1606377148313/nukasuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b41807-b851-4cc6-aaaf-25947f0dc343/citizen_skyhawk_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/avg_per_mac_free.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_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 5340 bytes
SHA-256: 0518421107415409ec6286908d73ecee4e2a57f20efd6138a884ffbd35959949
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 11640 bytes
SHA-256: 51dac7e85125c1eb4d99e8f3fbedac8207bf50bcab6b369e1e19603c2d5c58fc

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