Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c9884b8a9083af…

MALICIOUS

PDF

39.1 KB Created: 2020-08-18 20:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101e4f36d0b1001fa9329b7916527483 SHA-1: 9de1f16a927b293526e0ce9d87fe21880f7c6dbb SHA-256: 53c9884b8a9083afc082651fb2c8cdfb5c90419a13f719981ce515558e00a52e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'cat dissection digestive system lab report' and the malicious URL, suggesting a lure. The presence of numerous Shopify links, some benign and some unknown, indicates a potential link farm for distributing malicious content. The ML classifier strongly flagged this PDF as malicious.

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=cat+dissection+digestive+system+lab+report
    • http://files.shizicoyi.com/uploads/1/3/1/4/131437107/bufab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2905/files/21772430626.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/vewoximavatovafumupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/fanasosiliwezosuxedova.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/koneduxewokore.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/varudorinupuko.pdf
    • https://cdn.shopify.com/s/files/1/0440/0594/9590/files/mathematics_in_the_modern_world_college_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/2866/6785/files/agni_siragugal_book_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/satin_camisole_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/11389009639.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/7031587928.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/biraxirizufisumukawamema.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_off000058fb.bin
07ca63a38defcada94525382240930890f78b2fa99481350992e5d0eb3d4c2b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x58FB 5600 bytes
font_01_sfnt_off00006bee.bin
8d9c95fcae42f6ebf70a64c3e3eda0dbc2b9b008a8e28ba44fd54f7d5da0eb61
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 9944 bytes