Malicious PDF — malware analysis report

Static analysis result for SHA-256 18729f0347b820bc…

MALICIOUS

PDF

50.5 KB Created: 2020-10-30 19:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dbd436449f4640c72926361542b2ff37 SHA-1: 82757e0bcd290d471e28162c82b856a57a147b34 SHA-256: 18729f0347b820bc6e40ec093fe45b4b6297691a4deaa411237c2f08aeb3e090
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs hosted on disposable domains, suggesting a link farm or phishing lure. The primary malicious URL identified is https://ggtraff.ru/aws?keyword=mark+hughes+herbalife.

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 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://ggtraff.ru/aws?keyword=mark+hughes+herbalife In PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/wawer.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/1559815.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/gugoloj_geporuvusufap_fosarupurozufu.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/nifasanimep.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/5d6f2da.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/7878292.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/jazuravazaguz/damuzumufadexojulujupefel.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/niguzaraved.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/merchant_of_venice_folger.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/icy_veins_fire_mage_talents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6161/5003/files/xuwen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1192/2877/files/magic_in_the_hamptons_meaning.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_off000085d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 5236 bytes
SHA-256: 347da9f3ddddb28c57f1161c95db45f3ee4c8bc40e716d78e07415337cca01a4
font_01_sfnt_off000097b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B4 11868 bytes
SHA-256: 0985e163f9fc756ddcf5bd6df97459fd3d4f965e8842bc9339d2663f7b750c6e

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