Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d491aa889ec63b…

MALICIOUS

PDF

66.2 KB Created: 2020-12-17 01:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d09463aea75a7c61fb526f1c284abfcf SHA-1: e6502f9fdbc8e891765da1943d8d288c02e37a8f SHA-256: 22d491aa889ec63b371ef0b952654fd547228b48192bce7df694fd2a92f6adc8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text that appears to be a lure for a game download, suggesting a phishing or malware distribution attempt.

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://cctraff.ru/aws?utm_term=hungry+shark+world+apk+android+1 In PDF document text
    • https://jelopujepifo.weebly.com/uploads/1/3/4/3/134341958/e950d01cc4ca450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fcca8e471036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5fc57f3003741.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/5fbce344be7cfc36344e8aaf/t/5fbcf320b474932ca266a4fb/1606218528440/bohemian_rhapsody_score.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/13888667315.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/home_buy_vs_rent_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/92710052996.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc670929698b02c7f46b266/t/5fcc6b747ae85b53b289aa3d/1607232375886/how_to_draw_cut_the_rope_2_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/caudal_regression_syndrome_how_do_they_poop.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/constructing_a_cladogram_activity_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/52826448888.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/26668546857.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/kusotuwa.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_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 5492 bytes
SHA-256: ef8a9bd2920c043e3d0d4d85059e17bdb5849c40e55b49e7bdaf68730548f776
font_01_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 11156 bytes
SHA-256: e9e5a80c84b3cb0e68739ddc91efbf7d2bcb2a19fee0240fd7f7174bc4811370

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