Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d6b75e0bc3a45c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 09:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8588b8cd45530bb17d0e8ad8f69de887 SHA-1: 69dec303507dd58c34ee16fb69ceeea8265fec52 SHA-256: 04d6b75e0bc3a45ccf503ed71ffa0cf7d7b3d8b44e53e8498923e37283316658
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded document body text, though heavily obfuscated, contains keywords related to a 'Samsung tablet 10.1 manual download' and a URL that appears to be part of a link farm designed for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary 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.com/wix?keyword=samsung+tablet+10.1+manual+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/gestational_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0437/7742/5559/files/16733119503.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0859/files/muvidekuvitubilo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/83606032040.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6182/files/24818414552.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/65462833054.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/durga_saptashati_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/19979014253.pdf
    • https://cdn.shopify.com/s/files/1/0434/1678/0951/files/sunnie_jones_porn.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/waburomowoxesoto.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b2ff7c6da78439ab226d5ea488cd598.pdf
    • https://static.usrfiles.com/ugd/48d9a1_350000dbf51e4e4a825710d090da7f57.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_off000068eb.bin
ce7cbe1b4920661df3564fb241c34a9abebdd636a3bcb181326eed4d3953bf64
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 5608 bytes
font_01_sfnt_off00007bfa.bin
b608aba107fb76eb19d31ecf802bb01cd2fc8e3844e8a6e670892c2d94a4d60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFA 10672 bytes