Malicious PDF — malware analysis report

Static analysis result for SHA-256 7140b8363027b272…

MALICIOUS

PDF

76.7 KB Created: 2021-01-01 03:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a59c75bc626478f82cc774d17ed58a2 SHA-1: dc65ebb7da27835c1209204c24a5613f41a9921c SHA-256: 7140b8363027b2728c2998531440dd86348cdf1be27ccf1e0563ae6a85c6c7b6
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, with one critical heuristic identifying it as a PDF link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ggtraff.ru/strik?utm_term=face+masks+amazon+reusable', which likely serves as a lure for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to external malicious content.

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://ggtraff.ru/strik?utm_term=face+masks+amazon+reusable
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/wikusapa.pdf
    • https://cdn-cms.f-static.net/uploads/4483388/normal_5fb2f5617c861.pdf
    • https://vosorebozo.weebly.com/uploads/1/3/4/6/134698499/9074205.pdf
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5faff43b7b34d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tadovu/jinofolukuvodepilomuxafas.pdf
    • https://s3.amazonaws.com/xezonijida/telugu_album_songs_2019.pdf
    • https://s3.amazonaws.com/bidivo/2829423829.pdf
    • https://uploads.strikinglycdn.com/files/06e3069d-6f06-4ba3-8ad8-b866274cdba2/80645241892.pdf
    • https://s3.amazonaws.com/fokapikow/20121012975.pdf
    • https://uploads.strikinglycdn.com/files/451e86e2-0c8d-428f-b100-acc8574d0866/computer_basics_worksheet_section_12.pdf
    • https://uploads.strikinglycdn.com/files/f016fc57-e48d-46ce-a208-74eae079262c/29823840562.pdf
    • https://s3.amazonaws.com/fasanag/71131676500.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_off0000ed8f.bin
b6e15c87763e4ac426b1ae3eb39bd21bbe86f62c1dd999eb5d311e333ae2d85d
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5152 bytes
font_01_sfnt_off0000ff0b.bin
27a78a4b8bf4df3dbb72c3a7f4c14a52e8306a795fd0398f43ab266ab4486c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 11500 bytes