Malicious PDF — malware analysis report

Static analysis result for SHA-256 8789508467c5aa61…

MALICIOUS

PDF

49.1 KB Created: 2020-09-08 14:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0238d7939f8ac15dcb8818679870574a SHA-1: 6895b025e72c601e6e46a732d60ab9133448250a SHA-256: 8789508467c5aa61c3de3d865f8eccdab3b590f8ec59aab80aa9d36364e1604a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a search query for game rules, suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL is a high-confidence indicator of malicious intent.

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.link/wix?keyword=carcassonne+expansion+6+rules+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b98abb_8d255d393aaa48e4aa9176102978f81d.pdf
    • https://static.usrfiles.com/ugd/469aea_aa113770958e4315937eaafed30232a1.pdf
    • https://static.usrfiles.com/ugd/704f6c_f987bd7ec9c14b43b6f894fc31decb7e.pdf
    • https://static.usrfiles.com/ugd/bb4607_c457070b84b842259361fb99d95c3308.pdf
    • https://static.usrfiles.com/ugd/34ec99_ae0ef8faaa62409ab30df0f63d374231.pdf
    • https://static.usrfiles.com/ugd/dbad32_cb2cd370316e4566bcd78e47083fc802.pdf
    • https://static.usrfiles.com/ugd/b8c837_b47d83bc26854d53be8abf5ebdd4ab79.pdf
    • https://static.usrfiles.com/ugd/03dcd4_43c0840892624a5db41c3c6afc4bad5d.pdf
    • https://static.usrfiles.com/ugd/834936_f12ecce73363412388771a0c16a6e491.pdf
    • https://static.usrfiles.com/ugd/3f4b99_9b0604723ffe4a75a860d90dc9a11702.pdf
    • https://static.usrfiles.com/ugd/c268f7_605acfe09f3c42e4a3bf2f97b41637b2.pdf
    • https://static.usrfiles.com/ugd/5cf23b_f83ba631c0ed46d5811cd3991e9c8545.pdf
    • https://static.usrfiles.com/ugd/ee4d88_0c2c48d4fb514cc4bfa714037608c69e.pdf
    • https://static.usrfiles.com/ugd/d4da64_5039a6984dbf4771a3a83229f88b04b5.pdf
    • https://static.usrfiles.com/ugd/65e777_25c631ddbc484a3b878bb2cb12ed2ecc.pdf
    • https://static.usrfiles.com/ugd/229b11_30c02d03b5264e6491e31ffab6c8dc71.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000819b.bin
fe458b91a00eb2e36460bc823a0c4c73a8529f4e17788b67e0aa80238a55f9ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x819B 5276 bytes
font_01_sfnt_off0000939a.bin
206c06a021c0153ef244d348f4b5b92e94bc989b7c3db80f3e94dccd9f5c12b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x939A 10508 bytes