Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7aa4f7a6fbe931…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 19:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 655f8b168ca87b0ea5ac5d6ed930759f SHA-1: c74c82801fa784f823d098a4a97f98445d4eccc8 SHA-256: 5c7aa4f7a6fbe931ff9cf75ab1eca18a6d193da77a4a86b48f5696690a28840d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The primary malicious URL identified is https://ttraff.com/pify?keyword=balanopostitis+en+ni%25C3%25B1os+tratamiento+pdf.

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=balanopostitis+en+ni%25C3%25B1os+tratamiento+pdf
    • http://jorupa.arteristrutturare.com/uploads/1/3/1/4/131437508/949a9d3e89.pdf
    • http://files.divine-wellness.org/uploads/1/3/1/1/131164159/vilenivarelazakuro.pdf
    • http://files.heroesasylum.com/uploads/1/3/1/8/131871734/modujovedawutol.pdf
    • http://files.jcgafford.com/uploads/1/3/1/4/131452944/noxakupusemufar-zurolulikazazo-gimuporelunus-faran.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7691/0242/files/letters_from_an_astrophysicist_neil_degrasse_tyson.pdf
    • https://cdn.shopify.com/s/files/1/0433/8932/1366/files/21001370981.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/34931234830.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2155/0247/files/legipota.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/calculation_formula.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/satafer.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/33045206927.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39646295774.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/setolepujul.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_off0000648f.bin
90bc1240998d46da7012839f5eadbb939bf40c39a68eee8a0b788df00cbb1e60
pdf-font-stream PDF embedded font (sfnt) at offset 0x648F 5448 bytes
font_01_sfnt_off000076bd.bin
87e36d1434b874529c8515a07239b65426906a680547aca93769e59984b3a74f
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BD 12056 bytes