Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aa938530aea51e…

MALICIOUS

PDF

44.0 KB Created: 2020-10-15 20:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a42f76a315c707ed631b99ff9bd6c66 SHA-1: f7d4db89fedc3949c3f294a79dea5ee63c8ec295 SHA-256: 99aa938530aea51ea0123938cbc32a2dcf09fe660f98159a065a5b38c3fe0ee9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs that point to known malicious redirectors and disposable hosting, indicating a link farm designed to lure users. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links confirms its intent to lead users to potentially harmful content. The document body, though obfuscated, contains references to the URLs, reinforcing the redirection attempt.

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://gettraff.ru/123?keyword=substance+abuse+treatment+goals+pdf In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/2138756.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/c60283b4bf140f.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/73019986233.pdfIn PDF document text
    • https://site-1039303.mozfiles.com/files/1039303/paziros.pdfIn PDF document text
    • https://site-1040042.mozfiles.com/files/1040042/48312965938.pdfIn PDF document text
    • https://site-1042204.mozfiles.com/files/1042204/94373258135.pdfIn PDF document text
    • https://site-1043829.mozfiles.com/files/1043829/17342647758.pdfIn PDF document text
    • https://site-1038958.mozfiles.com/files/1038958/livabupol.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/dusoxetumuruwa.pdfIn PDF document text
    • https://site-1043337.mozfiles.com/files/1043337/74297056438.pdfIn PDF document text
    • https://site-1041501.mozfiles.com/files/1041501/nijipajejawevoranewazore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87026616959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f87241b6812a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdaacb0-c5dd-467e-951a-cf4b8bcfeb9c/25047133811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86222909-79b4-4954-9261-0592ee1b13dc/28936979146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8465b10-4326-45eb-b199-62eca3dc1c1b/tovagarinunitopuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9972/8293/files/rixobalileboxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8926/7362/files/kufobojonuzanujoxurovug.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_off00006ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 5716 bytes
SHA-256: 981c1c15a92b376c483823fa9e1ef55d150868d1a7ba5e105e6fca2d690d5007
font_01_sfnt_off00008032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 10164 bytes
SHA-256: ad4da4069e0686c63f82b6b2923719b872e646752653f47ec857aa53ec24c337

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