Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27108ba99df6f1e…

MALICIOUS

PDF

44.8 KB Created: 2020-09-04 02:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3325a25661fe5976394d69761c2bf205 SHA-1: 78a2cc84d61b6019e0819b7d79a0fc06f397f5c2 SHA-256: c27108ba99df6f1e3fda46638845efb2fa4e0768e28f5ec1b57b21db4ec9341f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, 'https://ttraff.com/wix?keyword=hypertension+treatment+sign+guidelines', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. No scripts were extracted, and the primary malicious activity appears to be the redirection to the identified malicious URL.

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/wix?keyword=hypertension+treatment+sign+guidelines
    • https://static.usrfiles.com/ugd/b56239_30d33402a281401fbc8a786404a7e89d.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_eab9510eb31f4cc8b69c5277b89cd66c.pdf
    • https://static.usrfiles.com/ugd/95bb70_feef3cdd85ef437cac53795fc8fd7535.pdf
    • https://static.usrfiles.com/ugd/8a419d_9d82bfd2e9794081b0d9c48747f9179b.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_8f1ea7953fd84698a1f9c7ad7fbab07d.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/57282385999.pdf
    • https://cdn.shopify.com/s/files/1/0448/5061/0336/files/waxezoxabezawikikekod.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/what_is_mp3_rocket_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/33096123848.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71135401618.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/kazatojikoxuvuful.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/jquery_check_if_element_exists.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0639/files/filisajeximuresukit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f7.bin
1d21ce41a27a2a4c65693e7f27b52607efb640f19f34ef169a29bd6cab209d49
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 5224 bytes
font_01_sfnt_off000074a3.bin
c9416129745e4a85e5e4795293d8a5759ce700d7192c32650e19b95b5ca1d1db
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A3 10444 bytes
font_02_sfnt_off00009869.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9869 4324 bytes