Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4e8911edd36c3d…

MALICIOUS

PDF

47.1 KB Created: 2020-10-09 11:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da67ec589f149cef37dcb4f74a629f51 SHA-1: ed69de872b5fdf556e331b84634165a6f4894010 SHA-256: fa4e8911edd36c3db89f67c8374a01a02863f4e79e32d8a41e187e4fe6afeab9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute traffic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/pify?keyword=hp+officejet+pro+8630+e-all-in-one+printer In PDF document text
    • http://files.mountainviewmentalhealth.com/uploads/1/3/1/3/131379730/8690367.pdfIn PDF document text
    • http://files.weststormontwoodlandgroup.org.uk/uploads/1/3/0/7/130776131/e6ea4f8c5ef622.pdfIn PDF document text
    • http://files.patchsprint.com/uploads/1/3/1/3/131379343/8edc7d6f9.pdfIn PDF document text
    • http://files.discover.optionstravel.com/uploads/1/3/0/7/130738765/xesuk-toxerazefan-wulatamefos-gunizogogudur.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/wogujodijiwenawuv.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/96844013290.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/vaseda.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/balanezalorizufimud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8113/7821/files/wabuzek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6313/9733/files/chula_vista_high_school_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6537/1543/files/the_giver_chapter_8-10_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0fe07a-89de-4141-8c2c-5500a5b159eb/91792734899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d3ca27-386a-49b6-9b6c-328ea11d06e8/gosore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b388b8a2-948f-46a2-adea-84ccb8551bcf/40859032903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cde9b9-513d-4620-9b99-5b6c128c884d/texepukipof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f91dbf1-67b6-4b2b-b092-4a8844b9fcad/tosepuxopawez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6994 5344 bytes
SHA-256: 111bbcd417e16c0ef846ea8d002b84aff7cd25c48241944a7b52342f94d8f9f7
font_01_sfnt_off00007bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 10272 bytes
SHA-256: b1af2c6088497a0470fa95531061aefe8e682ddd39cff07bd36ffc2f9f03b873
font_02_sfnt_off00009ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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