Malicious PDF — malware analysis report

Static analysis result for SHA-256 98912d4df5a011e4…

MALICIOUS

PDF

91.9 KB Created: 2020-10-02 10:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70be4cb21db971fd4d7b58fb9e800173 SHA-1: 33d786b0ac3655ef2c25819b4afddccb407cd00e SHA-256: 98912d4df5a011e46bfa1a12dc8cd4abbfb090692d3b69ef0a3afa96ed334da8
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is likely intended to lead the user to a malicious site, potentially for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=point+of+tangency+geometry In PDF document text
    • https://site-1038602.mozfiles.com/files/1038602/92242177438.pdfIn PDF document text
    • https://site-1041695.mozfiles.com/files/1041695/gafosun.pdfIn PDF document text
    • https://site-1037073.mozfiles.com/files/1037073/nepogosa.pdfIn PDF document text
    • https://site-1036693.mozfiles.com/files/1036693/fasusawerasoweru.pdfIn PDF document text
    • https://site-1039830.mozfiles.com/files/1039830/17341065285.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/47558804385.pdfIn PDF document text
    • https://site-1038530.mozfiles.com/files/1038530/5330357571.pdfIn PDF document text
    • https://site-1038303.mozfiles.com/files/1038303/gaxiretuxutitewavifevawap.pdfIn PDF document text
    • https://site-1039465.mozfiles.com/files/1039465/molepajegozomivitapu.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/soxajezudubibunu.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/33108483978.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/15932979862.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/45552348128.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/89158343221.pdfIn PDF document text
    • https://site-1040250.mozfiles.com/files/1040250/jukipedon.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/norojazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 4312 bytes
SHA-256: 42aa3830aac70959736cf806ba2e3dca15c8a48077c4184932d0012889ec9431
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 5092 bytes
SHA-256: 9289d9d966a7366683a309503588b5fbd7a2b8d56acdba86c895d690c06febf3
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 17188 bytes
SHA-256: b70e4922f6d230f889f5e5bb6dc8cd7761472daf026a70ef9c7a98af3a1cac63
font_03_sfnt_off00014ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE4 16112 bytes
SHA-256: a67f2bd40cdfd0919ac1dd28b381669acd0e9add0d67dc1437f0550c1d183dc5

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