Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e94a76cad41222…

MALICIOUS

PDF

34.4 KB Created: 2020-09-05 02:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 478cf37ef380ecaf3ba89f92c945d1e8 SHA-1: 3214186f87bea756d7e94f8dd1c0363b4c5a9390 SHA-256: 67e94a76cad41222805e2b0a823c5b5f98fdf2ec508d2ccf8123ab9c88bd81a3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The document body, though heavily obfuscated, contains the same malicious URL and appears to be part of a link farm designed to attract traffic. 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=bhoot+fm++from+fusionbd.+com In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/db80c5_af4a07bc7c814a778d3d42e6d187989d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cac9e4_ce0cac5c03934af3b15abd57b7f2b111.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/82d61e_5f10d97b006347d496299b76ec9b1d4b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c8d394_6e93196eb391476f916c5f80f252cb09.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2e16aa_41c8c437889d412d9667548574b73365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7586/9603/files/17953601894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/blackbird_flute_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/73405630080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/91789671841.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4479ed_c36e4de09af64aa9963aefa03eaac62b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/15ebe2_7a9ac7fdb59142c8a34f4fb45e1cb731.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000483a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x483A 5240 bytes
SHA-256: 8c72816472bf0b843e88828e98df04935ef892c6f0010051d381cc2b3e779234
font_01_sfnt_off000059ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59EE 10324 bytes
SHA-256: d099feede8d99683e0eca721cd955c0b187aac53dd65ead1110e7afc14c7d072

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