Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd413e79d817c83a…

MALICIOUS

PDF

64.1 KB Created: 2020-11-19 03:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 688c2f77b655fc03fbd9d690a0d2374d SHA-1: 58ee1d57af5fb7e08f512ae21aaedf174a53afd7 SHA-256: cd413e79d817c83ad869fe567afb59b58d2603b2e4c55b9db08cb722206bd56d
214 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to direct users to phishing or malware sites. While no scripts were extracted, the embedded URLs and the PDF's structure suggest an attempt to trick users into visiting malicious infrastructure, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=age+of+defense+4+hacked+unblocked
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/2f06df.pdf
    • https://fizozedodid.weebly.com/uploads/1/3/4/4/134484686/8af1c6c685d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buwosevax/12308539368.pdf
    • https://uploads.strikinglycdn.com/files/d2a437b1-54ad-44ff-9b12-6fe40c55a274/rejipisalomu.pdf
    • https://s3.amazonaws.com/dobesogum/76073928689.pdf
    • https://s3.amazonaws.com/bulolimepol/62518439827.pdf
    • https://uploads.strikinglycdn.com/files/2a260ae9-4815-41c0-ac8c-0540a08e7d47/the_chronicles_of_narnia_3_full_movie_download_in_english.pdf
    • https://uploads.strikinglycdn.com/files/34b7bd1b-03cf-4a69-a496-6a1d870bba9e/minecraft_1.16.100.50_apk.pdf
    • https://s3.amazonaws.com/bejeseja/tenexes.pdf
    • https://s3.amazonaws.com/forupokisip/sumotew.pdf
    • https://s3.amazonaws.com/tetazino/arquitectura_de_las_computadoras.pdf
    • https://s3.amazonaws.com/fukepez/lagu_yang_terdalam_dan_lirik.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_off0000bda0.bin
97ed0dfe1cef77e985b16e80d83a5b23a5bb7a06778c4adca43831f79084d6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 5468 bytes
font_01_sfnt_off0000d04f.bin
f59dcedf6c5791303c5e104f01de68ac919bb0a93b2ca03f1ff8e0b1347f4719
pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 10476 bytes