Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5518dce6199ede…

MALICIOUS

PDF

72.8 KB Created: 2021-01-06 08:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 33e5982370f55c91f8cfb019b79d83f4 SHA-1: aa647e39937779b63342cc53e6d119cc49cd6a33 SHA-256: ee5518dce6199edec1de3700d1bea272884c5483415f70ebca7e683ba0d22309
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL, 'https://cctraff.ru/123?utm_term=mybackup+pro+apk+paid', suggests a phishing or scam attempt, likely related to the 'mybackup pro apk paid' search term. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to drive traffic to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=mybackup+pro+apk+paid In PDF document text
    • https://cdn.sqhk.co/begorukenega/NWaghOT/risojanaxiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_5fb75cf0d771c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5fc311245ee28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5fb27452c6ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_5fd0dffa6df2c.pdfIn PDF document text
    • https://lizapomed.weebly.com/uploads/1/3/4/5/134511268/tetinifetugebid.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/ijicibn/magic_piano_pink_tiles_music_game_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5ff1d4bf9b474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/fexesedeva.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/vipixe.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/pdf_file_viewer_for_pc.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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 5168 bytes
SHA-256: 088ffbabdd40c8f7c7bc7cec3fd3133ba31e09f164be1ce18340142a75a93eb2
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10160 bytes
SHA-256: dbe7182d77156257259e97d623392731cefc966fac15d4a9cce2e37e1e34ec87

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