Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f560e53f2c513a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 00:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb703c9ce27dab32d458341fe9b4023 SHA-1: a36afb96ba20e8db70f88df58a570492a9fa184c SHA-256: 15f560e53f2c513a91ec14f7f3980826afc0b4418a831d151d4e495e10c7ee5d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with keywords related to nutrition. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm used for SEO poisoning or distributing malicious content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/pify?keyword=beef+a+roo+nutrition+pdf
    • http://files.allcustomiron.com/uploads/1/3/0/8/130874201/2779360.pdf
    • http://files.mcaprint.co.uk/uploads/1/3/1/6/131607095/7a09b6c.pdf
    • http://files.seattlegolfnews.com/uploads/1/3/1/1/131163737/1925660.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/studio_one_3._5_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/petovutonenazi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/tipopamujagitamejewizi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/losusemupozofiwob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0434/1900/9189/files/odoo_technical_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/vitoreworokipuloxela.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/ni_idea_meme_ascii.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/88560433160.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/black_embed_color.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/defaromij.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_off00006570.bin
aff0f511c07ee54cf12d72a0be27daf204bb1bc0fe7598fb7d05b479174844ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 4872 bytes
font_01_sfnt_off00007618.bin
6d238ebfb8b2ff715ab92639bf69b2fb0e63c1c88f5c45e92cf81ea709f19ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7618 15480 bytes