Malicious PDF — malware analysis report

Static analysis result for SHA-256 a508d150ee306c14…

MALICIOUS

PDF

60.7 KB Created: 2020-11-25 23:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 473f1e28ad1db410828fa2d9037efd77 SHA-1: 1656c2a8d7cca30b61fae10183d532c30a8eacd7 SHA-256: a508d150ee306c14117b0e4648140f350b9088d3ecd2010ddee82a05ca91d29c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, https://cctraff.ru/strik?utm_term=lost+civilizations+africa+a+history+denied+answer+key, is likely used to redirect users to a phishing or malware-hosting site. The document body, though heavily obfuscated, suggests a lure related to academic resources, aligning with the PDF_SEO_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=lost+civilizations+africa+a+history+denied+answer+key In PDF document text
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/luzif_tinixafo_xomedovud.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/tafifoxexezomaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fbd4bff96476.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/nagev/syracuse_ny_corcoran_high_school_diploma.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/hosanna_rock_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34ac79a-c3a1-41a6-992d-2b993760d0d7/77763037171.pdfIn PDF document text
    • https://s3.amazonaws.com/medetopuwofetut/southwest_flight_attendant_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/zapunosizibizepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4690ac8d-4d26-42b0-a9e2-106250c165b1/tipos_de_inteligencias_emocionales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac020979-7dc8-48a8-be35-db57e1051e4e/komodokuvobamolexudexomej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0126e82f-78e8-4535-9eae-b90614708eeb/garageband_free_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e206e1f-1498-4638-9795-12c6656b0e42/dazuxesamegikutukuri.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_off0000ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4B 5416 bytes
SHA-256: eb01eb901a7997a36902afe9b548172f01f07d817f9a159db3a9bfc7842c4550
font_01_sfnt_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 11012 bytes
SHA-256: a716bc40e3ba6712c471f3833328471ce71004fb17d1976ff1acdb90649ae2a4

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