Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f18e4c4767351d3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-23 10:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ea7fe3112ae13eef52fcabcc4c9e16 SHA-1: e9373686d451b3349eca57364e124cb3b4798750 SHA-256: 5f18e4c4767351d38e16aa330f55e74d98e31b6105db0ff58b3803690f245a82
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a known malicious redirector. This suggests the document is designed to redirect users to malicious sites, likely 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.ru/pify?keyword=newsletter+design+templates+word
    • http://gujaf.katherinekoehlerphotography.com/uploads/1/3/1/0/131070420/pulof_vumixaxuta_zaradeb.pdf
    • http://dabivas.accentplanks.com/uploads/1/3/1/4/131438379/milew-lasofudogixos-tisivogon.pdf
    • http://files.energizecolleges.org/uploads/1/3/1/0/131070611/cc21ae80.pdf
    • http://sefevitu.thecollegescout.com/uploads/1/3/0/8/130874359/rovagulagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/best_buy_application.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/xeredurepixodifopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/the_cartoon_guide_to_calculus_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/kezadutet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/50491881655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9062/files/fixinitumegekijof.pdf
    • https://cdn.shopify.com/s/files/1/0449/5910/5192/files/capteur_infrarouge_fonctionnement.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/vitisobavex.pdf
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/padaleruvadod.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/nelado.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/aospine_thoracolumbar_spine_injury_classification_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/pediatric_nurse_practitioner_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/barfu_am_klavier_original_noten.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_off0000633f.bin
93bb572459e7ccf646cf1313131e286d2d1cadabd939e904b3b0773e030f851b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633F 5340 bytes
font_01_sfnt_off0000755f.bin
ebe23ac912b1beaa37e163458016cd81ae8f15c39d63c3ffc9281941cf33d1ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755F 13000 bytes

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