Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd8da8185477ebb…

MALICIOUS

PDF

34.0 KB Created: 2020-08-29 17:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c1dd1d7a38732595928fa14edb44b39 SHA-1: 1813f95f33c29bf799406726ae80042e36ea69c1 SHA-256: 4dd8da8185477ebb1b9df410c1157666226f70a936de323e0efc85568683f63b
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing attacks by overwhelming users with choices or obscuring the true destination.

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=volar+alto+billy+laboy+letra
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/64958411562.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/61059766912.pdf
    • https://cdn.shopify.com/s/files/1/0435/2697/9739/files/idsa_ssti_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/la_boite_a_merveille.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/anime_old_man.pdf
    • https://static.usrfiles.com/ugd/b8c837_c046e6c9db3f4ae79f7e44e1e978235e.pdf
    • https://static.usrfiles.com/ugd/efb3f0_b807188a89734decb602bf4356934dc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4f1e1e5ff5b47909987506a0e287bf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_faef296725b646e9883756a4ebd6396b.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/facebook_page_cover_photo_size_2019_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/58385036393.pdf
    • https://static.usrfiles.com/ugd/b8c837_03f51cecd1f14850b602826146c68541.pdf
    • https://static.usrfiles.com/ugd/30e015_c16fc406335e4ba2b416f83999531ca6.pdf
    • https://static.usrfiles.com/ugd/87b9a8_4a204b60055c4e8d88fbfd3931ab8e9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a292157288c34cb6a8fde7ba316f5abb.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_off000049dc.bin
69a988f73bb2a4882c700f871bb26c21fe037fa95de300a9463f67336997d2bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x49DC 4708 bytes
font_01_sfnt_off000059f1.bin
d08102438c4b1381ff45eb10c908d5a3a119e6748f3268dffabe98aea285be34
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F1 9732 bytes