Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76354bbcf26b020…

MALICIOUS

PDF

35.4 KB Created: 2020-08-30 09:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d223b7eae08d740c3809e9e66bfb1a SHA-1: b5dc0d0af935b369fa575d941fdfdee1325b1da5 SHA-256: a76354bbcf26b0207baadbd26094f20e0f06165c8f1192dd74b53ad19c1ccaea
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing an "impossible quiz" and the malicious URL, suggesting a social engineering lure. The presence of a mass external PDF link farm further indicates malicious intent to drive traffic to external sites.

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=impossible+quiz+google+sites
    • https://static.usrfiles.com/ugd/dd4472_763940ed23914b1e99bc35649c16c88e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd34406ab50430ea2086a9692783284.pdf
    • https://static.usrfiles.com/ugd/b8c837_707dd770c9d44046818d941c272db7f4.pdf
    • https://static.usrfiles.com/ugd/078c79_17d51a041e5642398efc4739e3780a18.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa498cbccd3f411cb42edd933d93e5fa.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_814541f4625e4b18b6f4162c87a0ed1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f56671191947460eb84ea13a712d7700.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a50513b71d841099b13879ecfc9f6ef.pdf
    • https://static.usrfiles.com/ugd/32777b_cf7b45fe31f34433b1c8dd41b0e0bbbc.pdf
    • https://static.usrfiles.com/ugd/63d3ad_ed674cf742a5437288b95f62408fcca1.pdf
    • https://static.usrfiles.com/ugd/67e251_8da71921b55a4514888ff59e20d49f63.pdf
    • https://static.usrfiles.com/ugd/724bd4_8143c9834c90407c916a7431cb6877c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b08c57c3f46452da91f1e46197179dd.pdf
    • https://static.usrfiles.com/ugd/4b7290_7ab48748fde34182936ba85f87b7047f.pdf
    • https://static.usrfiles.com/ugd/bb13a2_3038a877421e43648efb773a373ddba1.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_off00004cbe.bin
d5f271fe07b716564dece66fcfa3cc5078f0daaa2f5dbc37817e4f9f5778d8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBE 5088 bytes
font_01_sfnt_off00005dfc.bin
e0aca3c3a76e08af4a3f7b9b8f364108049f8ebc7feac2b48d9250de1d5091cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 10464 bytes