Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d44165569738d62…

MALICIOUS

PDF

52.8 KB Created: 2020-08-29 22:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ff1dfce0d59d2f6f6b09ca0d373ce8d SHA-1: e8fb34e9573974442b166a477bfa072eac6610b6 SHA-256: 6d44165569738d62840d47b41956792aa8ebfa4b4d62ecdad107c067c777eb23
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious link farm. The presence of multiple external PDF links suggests an attempt to direct users to potentially harmful content or phishing 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=the+cycle+of+socialization+bobbie+ha
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_fb904af2b3944c8bbcb01118cdf8b5df.pdf
    • https://static.usrfiles.com/ugd/724bd4_02b6c1a81124495cbc5a382ce50a6d27.pdf
    • https://static.usrfiles.com/ugd/e02969_a6601984387b43a3ae91da61e6e5cd0b.pdf
    • https://static.usrfiles.com/ugd/ae059d_82a91a1eb1b94070bb4fe0c41c8f4e5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce8485c771254e16b8da408b3e5501c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62c544c6b27459db7f4b7e1f6e53453.pdf
    • https://cdn.shopify.com/s/files/1/0454/4351/4518/files/catalogo_avon_campaa_12_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/4364/9698/files/69864608389.pdf
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/bob_ong_si.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/xutopawasiboriguzivo.pdf
    • https://cdn.shopify.com/s/files/1/0457/0431/5036/files/best_android_games_not_on_play_store.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_off000090ec.bin
3b49e1ed12d4b93aecce7d0e701bebf2b8f3d504ace28b93857c7ddcc872abc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x90EC 5112 bytes
font_01_sfnt_off0000a263.bin
774f90407d22cf2747ae7a6e9825943c65567c22432cc72d11b3cae629337e15
pdf-font-stream PDF embedded font (sfnt) at offset 0xA263 10476 bytes