Malicious PDF — malware analysis report

Static analysis result for SHA-256 8778ff1d224d50c9…

MALICIOUS

PDF

56.4 KB Created: 2020-08-21 20:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9a9839f8636202c2aaf672b4e18bfe SHA-1: 451b1432dc7afdc56e5e9b6188f4927141fa9cc9 SHA-256: 8778ff1d224d50c931d2fcc89af3a9bd59bce3734b23b1560604a6f590410f27
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a reference to the same redirector URL. The ML classifier strongly indicates maliciousness, supporting the conclusion that this file is designed to redirect users to harmful content.

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=awdhesh+premi+ke+gana+video+mein
    • http://files.katherinedaugaardart.com/uploads/1/3/0/8/130874295/runeliluniza.pdf
    • http://gefofibi.craations.com/uploads/1/3/1/0/131070719/8189765.pdf
    • http://salew.lynabodiesfitness.com/uploads/1/3/2/3/132302921/595b067c.pdf
    • http://files.warnersofcoffeyville.com/uploads/1/3/1/8/131871621/1100351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/android_bitmap_centercrop.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/i_m_yours_ukulele_chords_easy.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/80881934602.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/befedinesufenoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/galudusegajedemexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/22831571664.pdf
    • https://cdn.shopify.com/s/files/1/0432/6880/0676/files/don_cheto_gang_style.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/2997/files/92286960154.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/atrocities_act_1989.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_off00008f79.bin
f7bb79867d14d6b4c5dbf3c68592586c82caf1f59cbbfe647c7e0eee9fee2860
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 5544 bytes
font_01_sfnt_off0000a246.bin
6db772ed51683f733334ae6c2625410eb33188d339284ef2bb902736513fff44
pdf-font-stream PDF embedded font (sfnt) at offset 0xA246 15380 bytes