Malicious PDF — malware analysis report

Static analysis result for SHA-256 655bc8a9096aeee3…

MALICIOUS

PDF

50.9 KB Created: 2020-08-11 03:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0633cd56379de951c3a4fcf9ab5d6986 SHA-1: 6d556b2060fe0ffc7ca847b9a6f543cc5c86a2a6 SHA-256: 655bc8a9096aeee3829c909757a0adc6cc3b49331be816f55c58946f161fac58
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites, potentially for phishing or malware distribution.

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.cc/pify?keyword=berne+convention+intellectual+property+pdf
    • http://files.spacesmonterey.com/uploads/1/3/0/7/130776822/rekipokerevafodav.pdf
    • http://files.otticacastelli.com/uploads/1/3/0/8/130814235/vukukunapezo_lukifisu.pdf
    • http://files.antoniodavidsinopoli.com/uploads/1/3/0/8/130873907/4090271.pdf
    • http://devigepe.windowcleanersvictoria.com/uploads/1/3/2/8/132814930/xavolege_nekipite_dajusabufo_vejelizuvalizid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/adobe_acrobat_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/nebajadofezinitekavomebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/patobitoxizota.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/26668817143.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/fiveke.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/30372820805.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/live_antena_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/1916/5086/files/pibaxorejoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/mogigodurak.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/85792937485.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/intermediate_accounting_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/6981/files/16036396408.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_off0000894f.bin
3b02161baa6be0741e420272b5ed2fa8bfa444d7e5f9f572eaf7a40d2a861936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894F 5180 bytes
font_01_sfnt_off00009b0b.bin
a33c69a5be89bdd8711c30ed550261a914ad03a2a758d2a89d580652e4a38750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0B 10356 bytes

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