Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77416e33dc2fb9f…

MALICIOUS

PDF

67.7 KB Created: 2021-01-14 06:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 542d533b40bd24a2827f84cfc148afa7 SHA-1: d3d220de3beb5d5ee7920a5901668c70f57af41f SHA-256: d77416e33dc2fb9f8667d560ffdc926d0ee3c12f7936007f41cc308e1877803a
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Slime rancher guide 2017' and application metadata, which likely serve as lures to disguise the malicious links. No scripts were extracted, but the presence of numerous embedded URLs points towards a phishing or malware distribution attempt.

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=slime+rancher+guide+2017
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/7465015.pdf
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fe8ca17315a7.pdf
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/torewedoxeruz.pdf
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/wobajibidejizonader.pdf
    • https://cdn.sqhk.co/joduragenep/ghjhghi/23191349292.pdf
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/6055306.pdf
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f97665d38b43.pdf
    • https://cdn-cms.f-static.net/uploads/4492257/normal_5fe793e92b45b.pdf
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd66f2683ab7.pdf
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fe0fcc19cf03.pdf
    • https://nimimemuxigu.weebly.com/uploads/1/3/4/4/134488465/4321983.pdf
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5ffba5d6e66b5.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5f8ea81c67a9f.pdf
    • https://static.s123-cdn-static.com/uploads/4403681/normal_5fefe0199cc98.pdf
    • https://cdn.sqhk.co/wufakinupo/chbhchb/fupejebimigifilular.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ca0b.bin
db5fd57da85eabda275e459ef8f2e9f240cdb8ed6241454f1c3222fc2b808638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 5684 bytes
font_01_sfnt_off0000dd3c.bin
f65cc2965593a406ceab204c6642042082f758c800a32ad746b86fd072a274c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 11060 bytes

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