Malicious PDF — malware analysis report

Static analysis result for SHA-256 e243bfc8f59493d4…

MALICIOUS

PDF

50.0 KB Created: 2020-08-21 12:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eb840adc2ea5a6847bcb15b90d4856b SHA-1: a04e6ed20ca33715849822f6321f6dbc7d3d183f SHA-256: e243bfc8f59493d41c6dd4d6bac5cd634943d0d61cd965fbdeb59a86826eb688
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'General cv cover letter templates'. The PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, many pointing to Shopify, likely for obfuscation or to appear legitimate. The primary malicious IOC is the redirector URL.

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.cc/pify?keyword=general+cv+cover+letter+templates
    • http://files.rejacnola.org/uploads/1/3/1/3/131380297/d1e3d200a19d9.pdf
    • https://cdn.shopify.com/s/files/1/0431/4261/1095/files/livro_after_5_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43106273748.pdf
    • https://cdn.shopify.com/s/files/1/0440/7564/7128/files/lojageribow.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/pejadoropixonarirega.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/mipuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/35747742545.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/franchise_disclosure_document_sample.pdf
    • https://cdn.shopify.com/s/files/1/0435/7236/3432/files/caccia_al_tesoro_gi_pronta_da_stampare.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/wiwobaropajaxobivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/apprendre__lire_le_franais_pour_les_petit.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/xumowikan.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/vagavixater.pdf
    • https://cdn.shopify.com/s/files/1/0463/1756/8157/files/administrative_staff_analyst_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/pezekeluguperuwegosa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008498.bin
bde4f7c7928d35211a2c7ac3f2d1fc93ddd407b83066070c5a1ab0c2368b0571
pdf-font-stream PDF embedded font (sfnt) at offset 0x8498 5172 bytes
font_01_sfnt_off00009627.bin
1af04baa38817a696dc0ae32a82fdb7b5a592d43f4713b9014c1e949438accd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9627 11044 bytes