Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7403cf485413f6…

MALICIOUS

PDF

47.6 KB Created: 2020-10-24 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d57a652753d1fbad6e18175a6934a4f6 SHA-1: 7c99f661944e71f3d2bce22fa507d17e7771da9f SHA-256: fc7403cf485413f663fbd1a227b99f50057b0a8499dd312a0f16cdc929da9bfd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lure the user to a compromised site. No scripts were extracted, but the presence of multiple external links points to a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/wb?keyword=scultura%20ecz%20351.bg%20manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5f922a5962b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f8bad2066f96.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/63a71.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/8d1be.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/9763468.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/sojebelevenex/xirediposapapusid.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/5204688174.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/24944970369.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/bafebevukonifus.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/47803747019.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/31130949349.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/al_ahram_weekly_newspaper.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/75181454094.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/cerfa_02.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/zovone.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/asexual_vs_sexual_reproduction.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/lozalelugor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0a9a7-0e4f-4e03-9be6-faf3fcb53718/76473762973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268c7cf6-f7b1-47fa-8b9a-0d0b8ca8277a/kozalesorol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f29317-0bfc-4913-a0a1-7b7f25d7ed28/xebimobafetav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4df467-56cd-4ab5-b2a2-15f607d27943/balagrae_roman_barracks_treasure.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_off000077d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D0 5608 bytes
SHA-256: 0145795f9d8a6ec39843a02b60caa6eecc268c06e644c11245d99d62ded7db59
font_01_sfnt_off00008ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE1 11512 bytes
SHA-256: 87297941657bf3e9b31b8443b6784ace1f2ba3011a2b5ccfbe26efa028c00cce

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