Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae188c5df2e8f35…

MALICIOUS

PDF

45.8 KB Created: 2020-08-19 21:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec127c9308914f7f76fb377c09321fe3 SHA-1: 3c75cd03140f4f74248d28fc891a5388a03980cf SHA-256: aae188c5df2e8f356f98dfee9e4713689c007d48b10ac407ad7c4be05c08b0d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same redirector URL and a large number of links to Shopify-hosted PDF files, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicates maliciousness.

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=cheap+formal+dresses+online+usa
    • http://muvud.iiamartmodels.com/uploads/1/3/1/0/131070450/6594414.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/63427027573.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/filurig.pdf
    • https://cdn.shopify.com/s/files/1/0437/4750/8385/files/61152622821.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/themes_in_children_s_literature.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7728/files/91672666042.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/artificer_handbook_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/36503240110.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/xajedadinezinuvetonegip.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/4953261835.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/vebogud.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/39661720092.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/fofani.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074e4.bin
863f6fc5ab00b80b28c881b7bbdc33052be27a48d89dfaa4be22dfe6b0860b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E4 5188 bytes
font_01_sfnt_off0000865e.bin
a5bbf489e091680c5c02751ed8b10361c7b93b875be102883b259632bd8a9f95
pdf-font-stream PDF embedded font (sfnt) at offset 0x865E 10528 bytes