Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46dd4fde96d86e1…

MALICIOUS

PDF

41.3 KB Created: 2020-09-01 23:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301d0c6992185674dbf776bf96e925b9 SHA-1: 66f7025fe254589e3c81a500b5a606c42e6979f3 SHA-256: c46dd4fde96d86e1e3a2fc1d6529ff974c67dbd18f9358364689e36775734217
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, characteristic of a link farm. One of these URLs, 'https://ttraff.com/pify?keyword=ammonium+nitrate+physical+form', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this URL, suggesting the primary purpose is to lure users to malicious infrastructure.

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=ammonium+nitrate+physical+form
    • https://static.usrfiles.com/ugd/270e53_db8f93bc13704e5b91c10be68c5f42ab.pdf
    • https://static.usrfiles.com/ugd/c33cdb_76e8a576ebfb43f9b65d6eb0577a1c87.pdf
    • https://static.usrfiles.com/ugd/d01287_6672e87b41e1440494bbebd3ec8f5095.pdf
    • https://static.usrfiles.com/ugd/e3c460_b3aabd5471f1433a8c2c580cc666f25a.pdf
    • https://static.usrfiles.com/ugd/69b86f_deaa5410bc344813a2ca5141c4a80ac4.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/62055122246.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6171/files/2019_honda_ridgeline_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0464/1603/6008/files/63110016308.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/bony_to_beastly.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/84768835672.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/ccna_1_chapter_6_packet_tracer_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9058/2435/files/46351548767.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/free_3d_animated_templates_for_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/70167397004.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_off00006437.bin
b3d3b55d2721429bb08594a871f049ab8e09c946e8f9fc850c84b089a61c674c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 5348 bytes
font_01_sfnt_off00007645.bin
226fd4e5b168930f3177b8b387c48a04403a47752948d5f7845bfe1310e75d7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7645 9952 bytes