Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b90e9b2fc97c2bc…

MALICIOUS

PDF

38.9 KB Created: 2020-08-16 00:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb25dcbcdbbfd61122fa15b39e9b594 SHA-1: d495ed7cd8ded0533246e0d412fee9fe0add21fb SHA-256: 0b90e9b2fc97c2bc3b82e48d6221d3ec8d55a47b6f91ca5e1c922d2f8befefc5
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 pointing to Shopify domains with seemingly random filenames, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=concepto%20de%20eclecticismo%20pdf', indicating a malicious intent to redirect users to harmful 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.ru/wb?keyword=concepto%20de%20eclecticismo%20pdf
    • http://files.shopivybloom.com/uploads/1/3/1/0/131070246/xifisumewalizibelari.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/20119574527.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32296476761.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/vepopuxiseduwafunogeretod.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/xuwukenopazon.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0392/files/xazokuzukawoboxiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/5186287019.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/fodowarutobadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/weteposedekiku.pdf
    • https://cdn.shopify.com/s/files/1/0451/9510/0311/files/medical_certificate_form_42.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/lubigemajubab.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_off00005a19.bin
6aab53adb6483c85822d7ee85bc34f0b7057e427080773807fa8d52653e6f3d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A19 4900 bytes
font_01_sfnt_off00006ab4.bin
d3a5134584ea6e5ec91c23391d0f693d02b315fc33a308bcfc3226a06d73e6df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 10692 bytes