Malicious PDF — malware analysis report

Static analysis result for SHA-256 1180be1e5e28e397…

MALICIOUS

PDF

56.5 KB Created: 2020-08-10 05:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432baaaf6c356a6de6ccdf750c4b8e5e SHA-1: f9f4b91e758c9dad06995a44d3e09c00f6465c63 SHA-256: 1180be1e5e28e397bc1ee017ea193ca5f2c50f9ef45d90a91bf8666b090adc51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute content. The document body itself is heavily obfuscated but contains the primary malicious URL.

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.com/pify?keyword=insuficiencia+renal+clasificacion+akin+pdf
    • http://files.hourglassfitnessclub.co.uk/uploads/1/3/2/7/132740949/mexizekuzevowaba.pdf
    • http://ragigofe.upandovered.com/uploads/1/3/1/4/131453060/xabomoxufivukititik.pdf
    • http://files.umcaccountingsociety.com/uploads/1/3/1/3/131382330/0c8be2bc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6686/7362/files/importance_de_l_agriculture_biologique.pdf
    • https://cdn.shopify.com/s/files/1/0434/6629/3401/files/kurunigekalerifisasovawow.pdf
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/mufipajovijokos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/puneza.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/mythology_of_the_titans_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0450/0570/1284/files/animals_name_with_images.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/jefotetivitujakixalupiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/xorumiluvopimal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/91297142094.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/90260761962.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_off0000960a.bin
85fd8a19aabc25af5837bbdfb1d9f0d1f4da64892f44a615058550db16cacc4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x960A 5148 bytes
font_01_sfnt_off0000a7a3.bin
82daafcc7b6d737eb7296f3c8c3844e302fe982361f3be087c8959194ebeb430
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A3 14572 bytes