Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca983c93749fc2d…

MALICIOUS

PDF

42.1 KB Created: 2020-08-11 00:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0ea6c1c0246f2835b9df25eda2b260 SHA-1: ecaa07af1f7fb1362671c6227431a7242e01cb59 SHA-256: 0ca983c93749fc2d418bbcd00dec61e6f021aa192a6ab1dc0d22fbe1a70ba884
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as legitimate case studies, but the primary link redirects to a known malicious domain. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a SEO poisoning or link farm attack. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or 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 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.ru/pify?keyword=mergers+and+acquisitions+case+study+with+solution+pdf
    • http://files.somedaynewfoundlands.com/uploads/1/3/1/0/131070459/6e7b7e33a8316.pdf
    • http://files.alissaellisphd.com/uploads/1/3/1/4/131452827/844207.pdf
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/tebuvogifojetunovelifibi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/xixobosejofeja.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/aci_318_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5687/3128/files/zoxofasi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/75284966313.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/82881797847.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/alter_ego_plus_a1_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/90931845325.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/wumimidoxidetefofegag.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/terinegaboludugezijuvar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/oxford_english_dictionary_full_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0745/8975/files/vologi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/kutowa.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_off00006387.bin
ca4214dd9dcc0fc37a1f3492254872dddd47d283c6071b8bda0f836f03cdac4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6387 5740 bytes
font_01_sfnt_off0000772a.bin
e67186efd45b512359ce45f72105d8d3546b9a973ab639203c071bb5a1e5ca4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772A 10468 bytes

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