Malicious PDF — malware analysis report

Static analysis result for SHA-256 7580029965c2c7a7…

MALICIOUS

PDF

37.7 KB Created: 2020-08-14 16:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab7f00f9d0b675b74cd152ebf078681a SHA-1: 38b02b76cb8884c98522442bf88789771610f707 SHA-256: 7580029965c2c7a792bd965285dea8972e5a7b76d17abae83e25f7f3d30d00e3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains text related to academic PDFs and a URL that appears to be part of a link farm designed to manipulate search engine results. The primary malicious activity observed is the redirection to potentially harmful websites.

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.cc/pify?keyword=electrocardiography+for+healthcare+professionals+3rd+edition+pdf
    • http://files.bryanmaycock.com/uploads/1/3/1/8/131856917/144b0845a0ebae.pdf
    • http://gatorugi.nhgahplgsresidency.com/uploads/1/3/0/7/130776208/popofojar-difekud.pdf
    • http://files.sopoochtraining.com/uploads/1/3/2/8/132815961/kawivibugakovuj.pdf
    • http://files.homecleaniom.com/uploads/1/3/2/3/132302924/gijomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/tawim.pdf
    • https://cdn.shopify.com/s/files/1/0438/8726/3899/files/kozutusigojafabobif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/xemati.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/87661765866.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6071/files/vupekuxiromaxasat.pdf
    • https://cdn.shopify.com/s/files/1/0438/3011/6509/files/24955187035.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/etymology_of_religion.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7577/files/tabanelerofe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/77359705857.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazexirorojukulovamedifuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/31541476183.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/musenadefizeduk.pdf
    • https://cdn.shopify.com/s/files/1/0440/4353/4486/files/zududekewidolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9198/3512/files/backgrounds_5e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053c3.bin
ecdd9e6ae7cc9c3eaaa03767340120a9c2d1a959f0883bf10102af413cd83a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C3 5640 bytes
font_01_sfnt_off000066f0.bin
7369567a88dff582d6ea4db1acff20bb4baba2dc1414a39e1a0e224c0fac4f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 9996 bytes

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