Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e9571e575d1360…

MALICIOUS

PDF

45.7 KB Created: 2020-10-30 17:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c92be4c96a957cfb1c643c4249ed7c97 SHA-1: 3922bb0f672cdf6ab91d68a8b0460bc8db43843d SHA-256: 58e9571e575d1360b29b5c2d0db0e2be5e3f231da9b9434523700d64ce67ead6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO link farming or redirection to malicious 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://gettraff.ru/123?keyword=creepy+crawlers+oven+bug+maker In PDF document text
    • https://xinufagepowe.weebly.com/uploads/1/3/4/4/134437511/f2a5be69f5b2f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f8c7a839e715.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/bewomo.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/fixoka.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/673702ef.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/48b1d71.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/rarutodezoxim.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/2c3f87d1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/36113663315.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/26847903455.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/adobe_scan_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/noriberi.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/bi_rads_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/chemquest_25_formal_charge_answer_key.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_off00007126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 5616 bytes
SHA-256: f58b387242494dc0a3e3970318fc11c155059e34fc259c48efb5de473200e12e
font_01_sfnt_off0000844a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844A 11108 bytes
SHA-256: 3a70eb9b6f6f4440ea4a5d2b8f757fbb454a420a7751ba9151e894bc5ee7fc74

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