Malicious PDF — malware analysis report

Static analysis result for SHA-256 19066238c9101e6a…

MALICIOUS

PDF

33.2 KB Created: 2020-08-22 07:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84c6ff5d897ab6a31b0fcb39fbcedb2 SHA-1: 368bd85f0092ef40cb730e53fc3071c43ed5eaa4 SHA-256: 19066238c9101e6a70e502a68b0c66f361f2cdb21f474856bb257f97bdd91030
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=knauf+fiberglass+insulation+data+sheet`. It also exhibits characteristics of a link farm, with numerous external PDF links. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to malicious content under the guise of a data sheet.

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=knauf+fiberglass+insulation+data+sheet
    • http://files.mariecharpentier.net/uploads/1/3/1/4/131483019/batipaxadas.pdf
    • http://xubaxe.albanyems.com/uploads/1/3/1/4/131409909/falekebinikati_vejojabifak_fapuk.pdf
    • http://files.catharinegellings.com/uploads/1/3/1/1/131163635/degodopevoveb_kiluwagezisogar.pdf
    • http://notufu.atlanticblueaquariums.com/uploads/1/3/1/6/131606490/digamezabirikifigije.pdf
    • http://files.zenfreshcleaning.com/uploads/1/3/0/7/130775698/6084297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/24852313981.pdf
    • https://cdn.shopify.com/s/files/1/0439/7396/8030/files/86323214196.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/guwejodefazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/wwe_13_roster.pdf
    • https://cdn.shopify.com/s/files/1/0432/1964/8680/files/adobe_reader_dc_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/2271/9912/files/jupifisojadufebiradufapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/organization_theory_and_design_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/bovajadi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/xosakanemobawopuk.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_off000043be.bin
d35da776c1ae0c3ddb3e7d65cef375ac444ee92fb263cbe342afde3c8050a260
pdf-font-stream PDF embedded font (sfnt) at offset 0x43BE 5276 bytes
font_01_sfnt_off000055a4.bin
dd6bb0d280dc3ef84b82bc32e132595d72cfcde43db45182a55048f5d25cd96c
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A4 10064 bytes