Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d2054f0055e865…

MALICIOUS

PDF

40.7 KB Created: 2020-09-09 06:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e4d997c1356ea301949dbec840a5b9c0 SHA-1: 671c3431460126b8dbaef5b253628e15e543beab SHA-256: 16d2054f0055e8654f628689b7b48f5f9fe3384e6c3469d18e0d6e5616473659
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'career test pdf' and includes the malicious URL, indicating a social engineering lure. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=career+test+pdf 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/dcbeda_5f907665fe0948f0917be8ea0c591aed.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b80405_0bfad544adbb41e285435fc96f7eaac6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/35ddae_b1c5b278ba014d208f009f16445fed6c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f0e51d_db19f21171cf42e28ff7bab7f4ae79d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9bd8c3_17697d9041ca48e9a649792c4f587932.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c4177_bb8f11ae2f0e4790a707472a225081c3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e02969_a90cf0cb60464090b22739d0a5927fa0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9d869b_a1924f491c9849979de85163f8900d67.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1dfe8f8888b8491f80ea938412e789d6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2d797c_3bd1c1d6e9984aeca6ca001e796da68e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d9a50_89847ceabc124b2eb8cc5fa12a1d73cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3107dfe9b730412ba74a3e62a761ee0c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/64db51_5d16205963d8432ca08a0bedcbee327e.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_off0000639e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639E 4908 bytes
SHA-256: b72964c31854738a172af3759c1f073cbcdcb5fbe6025e6900d0ff7ea4be5321
font_01_sfnt_off0000745c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745C 9952 bytes
SHA-256: 31f3734505efb1053ece54884235b01c1b478ce7e1353aa88ba62675995d53e8

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