Malicious PDF — malware analysis report

Static analysis result for SHA-256 4527c409f9123556…

MALICIOUS

PDF

41.5 KB Created: 2020-11-07 08:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b518864b1b4fe8e8474052b9f7f7e6ac SHA-1: b2bacc96d4d99cd4793b943ea630b5a62dcaaba9 SHA-256: 4527c409f9123556e575e7eb3d74278d6805403f613a987982762c35cda3a5b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://traffmen.ru/aws?keyword=toy+for+formal+operational+stage In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeponodij/marq-e_entertainment_center.pdfIn PDF document text
    • https://zudevize.files.wordpress.com/2020/11/2016_dodge_dart_se_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8c5c3f-3012-443e-bcd7-21371fc0093b/48590394182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00dc4840-859c-4cf1-93f0-b1f1cdd3f4dc/82820690176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc6869a-abe9-4403-ae09-a051f762d36b/5231653119.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/6193370606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baad6e6-eb6f-4627-be26-dc00683bb33c/bupigapirofonotuwixuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6a5ebd-088f-46c1-ae40-f32d75bff43f/79030370144.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/world_geography_countries_map.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/ruger_10_22_bolt_release_plate.pdfIn PDF document text
    • https://zuvebozukovo.files.wordpress.com/2020/11/the_hunger_games_mockingjay_mp4moviez.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/98737228371.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/poverty_alleviation_programmes_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1000cd-bad4-45a0-bb44-5030934f26d9/58537360214.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_off000065ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CE 5272 bytes
SHA-256: dc12947057a9534486fbe52056d9f4cf81344efa42cbc03a9543535efc91209b
font_01_sfnt_off000077af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 9912 bytes
SHA-256: ba6f62ad6555038f5098480e8aeeefbbaf4f9483e1ef385223463f052b7c1781

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