Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b3da0e50244c80…

MALICIOUS

PDF

66.5 KB Created: 2020-08-04 04:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248155e9dd051482131ec675225c9431 SHA-1: cdf080a15f07c0a22ccaa60d10b12579b51ac416 SHA-256: 41b3da0e50244c80daf369742310a3c4beba2376637ffcc3fca386db6ba3fd07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=apostles+creed+new+version+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent to redirect users to potentially 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=apostles+creed+new+version+pdf
    • http://files.charleesangelsboutique2.com/uploads/1/3/1/3/131398219/9801470.pdf
    • http://files.rjensalada.com/uploads/1/3/1/4/131482975/c6bec3bd2a7425d.pdf
    • http://files.trans-it.org/uploads/1/3/2/7/132740564/sebuzirew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/89409481062.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/kulanadojumuvuzavobegun.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/wubatowufukazoxubibaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/80134332527.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/moxavexizeniwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9929/0776/files/codex_space_marines_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3221/files/74645965057.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/31809107217.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/pebuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/58438570996.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/80168561638.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/caracteristicas_de_los_alcanos.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_off0000b73a.bin
d37d58e38a6fdefcdf50b9f07d058dc0998bead037179b05b4c0d8d7291c77b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 5080 bytes
font_01_sfnt_off0000c8ae.bin
fdb643e89d8962922f2a37ed6bcf593466ed014b1af99f3958758489f0e07b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 19408 bytes