Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb59cc23b6870c1a…

MALICIOUS

PDF

48.7 KB Created: 2020-08-15 08:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e92124392e35adc1043647caf748154f SHA-1: 19ba4724ead7d69946373a5676b13278cb5d69eb SHA-256: cb59cc23b6870c1a066a34a24c80f7739d31a639652aabf396b82e635ba69588
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.cc/wb?keyword=strategic%20management%20pdf%20fred%20david', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of a malicious redirector attack pattern.

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/wb?keyword=strategic%20management%20pdf%20fred%20david In PDF document text
    • http://kunibok.dixonrams.com/uploads/1/3/0/7/130740051/zefumowolatupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/9768559865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/51959522495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/pikuru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/19991430288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3792/5281/files/how_to_make_grass_grow_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6760/4128/files/foxegutakaluxelabukete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/5568/0410/files/gomufadojevalejivem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/biotic_and_abiotic_components_of_forest_ecosystem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/vanilla_wow_skinning_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000811f.bin
e9c3967186a09a8e455853d23237dc9a3427082b7eecf9e34775a0bfd065413e
pdf-font-stream PDF embedded font (sfnt) at offset 0x811F 5428 bytes
font_01_sfnt_off00009380.bin
6cf00315b517abe32e8e104f6e184d98b5fc44e571a0d6f7365e5384094229f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9380 10128 bytes