Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9a5eb9ec2af74c…

MALICIOUS

PDF

66.6 KB Created: 2020-12-23 04:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2a4a190996750518f207defa540c68 SHA-1: 58fae150d7e46d55ca5e972e15ed5f0f74576319 SHA-256: 7c9a5eb9ec2af74c02760d3fdc4049a1abcf5f3061a1d043cf92f39a2621399b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating it likely contains malicious content. It functions as a link farm, directing users to numerous external websites, including a known malicious redirector at 'https://cctraff.ru/strik?utm_term=top+50+wedding+cake+designers+2019'. The document body, though heavily obfuscated, suggests a lure related to wedding cake designs, which is likely a pretext to encourage clicks on the embedded links. The presence of numerous PDF links and the use of disposable hosting further support its role as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=top+50+wedding+cake+designers+2019
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/xiped_tiparelazelu_bofugefunu.pdf
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/toxuvebiladovijivol.pdf
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/fd3b7fa01bfe1df.pdf
    • https://gudagomafefaxer.weebly.com/uploads/1/3/4/5/134523608/1114506.pdf
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/vikodi.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/dulevukikesejit.pdf
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/nirawezakipol_jezomitizonuruv_wuliwawubufavu.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/2e70f709551c255.pdf
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/6156926.pdf
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/foworevolizedegalib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jofunozuzof/gta_5_apk_and_obb_download.pdf
    • https://s3.amazonaws.com/remeranexe/the_dorset_school_dorset_vt.pdf
    • https://uploads.strikinglycdn.com/files/faf5bd75-d26a-4c87-94a0-d45fdce1c593/padelafarerodujem.pdf
    • https://s3.amazonaws.com/wizedumi/lorimirekimunub.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_off0000c701.bin
aa0980a784c8074c24b1aeed4f56d342e2d62552ce05c7bd540bb1e285444a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC701 5920 bytes
font_01_sfnt_off0000db56.bin
4991bf1680bf50a0c2790b14584e63dd1760200da742a5ada2bd0aa3ad7378f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 10156 bytes

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