Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef0eb0ae0aaf2ca…

MALICIOUS

PDF

65.4 KB Created: 2020-08-22 04:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361aca920076cb437e017cc26014aded SHA-1: bdb0c232f597fa100e53634521a153dadd6df242 SHA-256: 0ef0eb0ae0aaf2cade93cc6ffdccbc5e9b8e5257ac00563ff9b8289a08ed7f93
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 indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body itself is heavily obfuscated and contains the 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.cc/pify?keyword=limnos+report+tv
    • http://files.premise52.com/uploads/1/3/1/4/131410158/saroxerururunafezugi.pdf
    • http://tonutud.seeniunmedia.com/uploads/1/3/0/7/130776873/8204604.pdf
    • http://fuviruwu.hemlockhappening.org/uploads/1/3/0/7/130775923/3177053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/84990246651.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/adventure_capitalist_support_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/66180688191.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/cantata_de_natal_alegria.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/bulizufevepolozofuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3363/files/biotecnologia_en_la_industria_alimentaria.pdf
    • https://cdn.shopify.com/s/files/1/0437/9980/6113/files/why_are_you_applying_for_financial_aid.pdf
    • https://cdn.shopify.com/s/files/1/0437/4904/8474/files/ibm_spss_modeler_applications_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/wexorubamanonofiraxilis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/24793499366.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/12763057695.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/37137998094.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_off0000b893.bin
62fec05c4587fb84197b909fa630b35a5eafa5cc42231f50282fea97f3fdcf27
pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 4724 bytes
font_01_sfnt_off0000c894.bin
685ac987322447c8e8773b40b250d85fa40bad9dd8758689f811eaeb84679ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 15476 bytes