Malicious PDF — malware analysis report

Static analysis result for SHA-256 88497c6c85171c3e…

MALICIOUS

PDF

49.0 KB Created: 2020-08-04 00:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6baee3375164170f834a330e88ff771 SHA-1: 0fa72eda418db6cf34ded20f00acfbb8bfe8a2d2 SHA-256: 88497c6c85171c3e0b04b79e20e8b389c4884b95d4e58c54d8603719c506e6f9
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a malicious URL, disguised with a seemingly benign topic. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to drive traffic to external, potentially harmful, sites. No scripts were extracted, but the embedded URLs are the primary indicators of 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.ru/pify?keyword=effects+of+plastic+pollution+on+human+health+pdf
    • http://files.thswebpages.org/uploads/1/3/0/7/130776826/1212569.pdf
    • http://files.ogilvies.scot/uploads/1/3/0/7/130775309/3152752.pdf
    • http://files.trivalleysir34.org/uploads/1/3/2/7/132740413/sipoleluzo-lasogusapigud-wesikir-wosowamesadisit.pdf
    • http://files.flaniganssportsworld.com/uploads/1/3/2/6/132696233/mekak_kujanox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/74996678627.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/18120823728.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/19006745782.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2057/files/99085494665.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/71277503753.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/rasowuzemuwalexumawu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/lapigelasa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/74945567600.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/warcraft_3_frozen_throne_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/47508747905.pdf
    • https://cdn.shopify.com/s/files/1/0439/6482/5758/files/64480001343.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/denadidowejutiberaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/tbc_leatherworking_guide.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_off0000811d.bin
a6d754ee666431dd87bae8316da4b53682e44f06c60498fb9e96baaa98e5c920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811D 5256 bytes
font_01_sfnt_off000092e4.bin
eebe3ae850173eb3fbb03659242246afc3bf78153515ef05b6ca5f4785384f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E4 10364 bytes

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