Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b85597796421179…

MALICIOUS

PDF

36.8 KB Created: 2020-08-14 03:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1692cd46c9d17a935e0e6b96396902a6 SHA-1: 11170eedfb953bc9b33615025a79e3552c1b600c SHA-256: 0b855977964211799685b21a4954b3383bc4fee6b551b37df0422f073462e86d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a link related to printer software. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also 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://ttraff.com/pify?keyword=canon+mg2570s+printer+software+free
    • http://jujawen.christopherlauto.com/uploads/1/3/0/8/130814328/b3207053c.pdf
    • http://monajolog.bbfsfiresafety.com/uploads/1/3/1/3/131383478/739468.pdf
    • http://files.ftmpevents.com/uploads/1/3/2/6/132680808/vidatudifulomiv-komuwa-mawijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/38192098416.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/kifiremosunegizesig.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/50032438317.pdf
    • https://cdn.shopify.com/s/files/1/0436/7250/2425/files/craftsman_87702_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/advanced_financial_accounting_christensen_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/wukake.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/62872919700.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/topuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3537/files/peguwiles.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9944/files/53839210086.pdf
    • https://cdn.shopify.com/s/files/1/0432/2938/0767/files/convert_file_into_word_format.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_off000050b9.bin
90dd0c9a71cdad6758b76d2158149977e2cfe9634784b033f36ad7515ef60ac0
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B9 5664 bytes
font_01_sfnt_off00006404.bin
8c0b847182fa2154c44ddcb9bdd262795786c473be881687ed344eafb5357ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 10172 bytes