Malicious PDF — malware analysis report

Static analysis result for SHA-256 321900f330b63dc7…

MALICIOUS

PDF

43.9 KB Created: 2020-11-02 23:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1386244c5e0ebf1d50b0c9dedf262a1f SHA-1: 072df2a148b5d0e8b62ee094e208db0969c5c86f SHA-256: 321900f330b63dc7dfd277fdfbb2915ff047521f3d66bc5429233ab84ce8c241
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to external, potentially harmful, content. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

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://ttraff.com/pify?keyword=sean+gayle+bears In PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/26d311e9e9e80f.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/7904252.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/zaxoga.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/fekojoxu_pavexifikaweke_laxakupid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/famoxiji.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/harbor_breeze_dual_fan_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1700/9855/files/15219661581.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/xobaxabomemuginojazudomaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9ec364-7f8e-4572-b4fc-53d4e167f1fe/senderos_fronterizos_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f528c1c-47a8-4f2a-9d00-160426dc3673/38139098713.pdfIn PDF document text
    • https://s3.amazonaws.com/xotorulu/ge_front_load_washer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0e10b0-53d4-4375-9f5d-6e81015b3a35/sogarirog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6245/5191/files/xuzivaduzefijowimopo.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_off00006e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 5196 bytes
SHA-256: bcdf77d43f480667a7ed554711d7dfb9ee46eabb174c5cb7606c76851eb2b29c
font_01_sfnt_off0000805a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805A 10144 bytes
SHA-256: ce2608d0b249046241a82ee30123bdb22f2db11e13a107be1b1836171673ed12

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