Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4d99d11a0b0d50…

MALICIOUS

PDF

46.2 KB Created: 2020-08-17 15:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf6110da0265e8258ac15272e1226898 SHA-1: 7a736756745bc96e4bff2e65780f4e0dd8e97054 SHA-256: 6c4d99d11a0b0d50ec3edca1e2ea1f228103e5e659162204eed9653e57911f20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting an attempt to lure users to malicious sites, potentially 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=aws+cloudformation+infrastructure+as+code
    • http://files.kpeggphotography.com/uploads/1/3/1/4/131437064/68c4f2edbe8048a.pdf
    • http://files.weddingceremonypro.com/uploads/1/3/0/9/130969885/165cdfd2eb50ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigorekotat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/sokiwowoxojagux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8889/files/51503893876.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/71662792765.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/xojamulilokekur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/fusidekinolixod.pdf
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/a_plastic_ocean_documentary.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/gimp_user_manual_2._8.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/57971191114.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/caterpillar_3208_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/13934686647.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_off000077f8.bin
605c9357424d24ac10da23d2f2bcc85cae43e85ffd6a6a2ca896f77596db7b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 5248 bytes
font_01_sfnt_off000089bb.bin
936adafcdf0240abc2f00f68b2f8bc9a6fe3e30f8cd05fbe3446f70dbcfe2b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x89BB 9996 bytes