Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bccfe69d0a1b5f7…

MALICIOUS

PDF

46.2 KB Created: 2020-07-08 22:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 034e50d53dfbdc4c7a60ff70cef5113e SHA-1: 91f658c1131f3e6e0597c3ad59c1b79247546c97 SHA-256: 1bccfe69d0a1b5f73da782e54dafd073a73bdd1d883272ba4b99b5bb520c0600
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/wb?keyword=warrior%20cats%20omen%20of%20the%20stars%20book%204%20pdf. The document body, though partially obfuscated, also contains this URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://ttraff.ru/wb?keyword=warrior%20cats%20omen%20of%20the%20stars%20book%204%20pdf In PDF document text
    • http://files.abckidsafrica.org/uploads/1/3/0/7/130739830/5693f38f1.pdfIn PDF document text
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdfIn PDF document text
    • http://files.bodytherapybydai.com/uploads/1/3/1/4/131453248/zunijimulamaton_fevumisu_xomefu_zoluzekofizi.pdfIn PDF document text
    • http://files.andrew-hendry.ca/uploads/1/3/1/8/131872048/zujivabuxavirezisi.pdfIn PDF document text
    • http://files.chaplainsinternationalinc.com/uploads/1/3/2/6/132695467/3579921.pdfIn PDF document text
    • http://files.kathrynpentecost.com/uploads/1/3/1/3/131383549/demur.pdfIn PDF document text
    • http://files.willshowstopper.com/uploads/1/3/1/3/131383510/wufazax_lexow_tatutamiwuro_gajuwepu.pdfIn PDF document text
    • http://files.mpowertheworld.net/uploads/1/3/2/7/132740415/kadisetiwebuget_rofajanagojata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tarareg.files.wordpress.com/2020/06/8094217553.pdfIn PDF document text
    • https://jupeveni.files.wordpress.com/2020/07/pijizixasememutawakij.pdfIn PDF document text
    • https://pabajifulis.files.wordpress.com/2020/06/daruvame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7755 5456 bytes
SHA-256: 1375b52e3a767cba2fd8089f48b9741cc1e237156b8864a7f3470f853cde7066
font_01_sfnt_off000089b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B9 9968 bytes
SHA-256: a07510c5cddf1eed6a5aa71f0bfcbde87a9d16583e08c12924082c5877d89003

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