Malicious PDF — malware analysis report

Static analysis result for SHA-256 591aa2e395375e9e…

MALICIOUS

PDF

32.4 KB Created: 2020-11-04 09:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 855bdfdc765c1540073d81fd544e3e20 SHA-1: 1d0bdccab7bdad513a5d73da9b01e41796ea3eeb SHA-256: 591aa2e395375e9ee924b3e1130ec523b1c80cef8653ffd741855b41c59380dc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to harmful websites. The document body also contains a URL that appears to be part of a link farm, further indicating a malicious intent to drive traffic to potentially compromised or malicious sites. The ML classifier strongly flagged this PDF as malicious.

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://ggtraff.ru/aws?keyword=free+printable+i+message+worksheet+for+kids
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5f8f9e1d2c6b8.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/vojefivez.pdf
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/8753801.pdf
    • https://lavigepes.weebly.com/uploads/1/3/4/4/134437347/sakakoda_rigomiwujozur_jomikupofivu.pdf
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5f9e130a4bc5d.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8f94196ff49.pdf
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/66108285.pdf
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f8d4bccc8435.pdf
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fa01a2b56a91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/302326d3-6440-4b49-90f0-657822d078e4/gepotodevazebota.pdf
    • https://uploads.strikinglycdn.com/files/4cae7d9d-d7d0-4386-b137-fdf9c4aa8988/83193243962.pdf
    • https://s3.amazonaws.com/webipejonavuv/important_abbreviations_for_quiz.pdf
    • https://s3.amazonaws.com/susopuzupure/will_asta_ever_become_the_wizard_king.pdf
    • https://s3.amazonaws.com/sinamozagemoger/xojoxujezazoxuvofuviwalij.pdf
    • https://s3.amazonaws.com/tixedujegibex/29019023855.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004449.bin
931c32ab281d7d20fa7114677811756765cc8c09663320d79a9f675fedef7c1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4449 5704 bytes
font_01_sfnt_off00005792.bin
0fe16f5deef845b81cd59ddca96cfc22f40e5868fba8abeb88dbefce53600ead
pdf-font-stream PDF embedded font (sfnt) at offset 0x5792 8556 bytes