Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8f710a5b664e17…

MALICIOUS

PDF

41.5 KB Created: 2020-09-01 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b743edc5700eddb07170fe09373835 SHA-1: 378a6ada6883c5b87ddcfa783a0544db62c9f635 SHA-256: cf8f710a5b664e17f400b56716579c5b190ae392db55ad8184ccddc4f754fce9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wix?keyword=list+of+occupational+diseases+pdf`. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier also 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.cc/wix?keyword=list+of+occupational+diseases+pdf
    • https://static.usrfiles.com/ugd/61f964_0d74633969f14534a302b1a27b62305e.pdf
    • https://static.usrfiles.com/ugd/96768c_376782738c9844bdb9f4ed36fd15f1c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_242d8a42896446b8bdb5e110d5094ce0.pdf
    • https://static.usrfiles.com/ugd/b11f6d_cc4ed190823645f28b819e9a4a484955.pdf
    • https://static.usrfiles.com/ugd/dad90e_d5f0792afa324e03a1ae8d04268d75d2.pdf
    • https://static.usrfiles.com/ugd/fbccce_0f04e287f0154c9c84dfe319e74378f5.pdf
    • https://static.usrfiles.com/ugd/0d089b_b4e7227e46dd47688a7e830a315c5f46.pdf
    • https://static.usrfiles.com/ugd/b8c837_d424ac2844b1474390a801dd8b290f2a.pdf
    • https://static.usrfiles.com/ugd/913720_d5fa9d5860ce40ada810151f613e8c21.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/jinevuxabuvogafinesakiwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4861/files/80489812242.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/fuxataliw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3159/files/zimurudukik.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653b.bin
56f2520e921709abb29ee58a37a8251d1286d5b1782d1339094b6eb40e64ec30
pdf-font-stream PDF embedded font (sfnt) at offset 0x653B 4992 bytes
font_01_sfnt_off00007653.bin
e29937b9b80393d7a1676418c9ad1608861bf2374f1e0099dc60e7df0cd637f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7653 10352 bytes