Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df77c811d2b078b…

MALICIOUS

PDF

45.9 KB Created: 2020-08-19 04:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18efb03e67bcb0fa05c864c8d06cee32 SHA-1: 01392e4d9dd0ec8138a4184137cee46f1c471906 SHA-256: 7df77c811d2b078b8592fe5381d3896e7a659f5716775f0dcb0e0beeb975f730
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'multiple sclerosis treatment guidelines europe' and the malicious URL, suggesting a lure to a scam or phishing page. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms the intent to lead the user to a harmful destination.

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=multiple+sclerosis+treatment+guidelines+europe
    • http://defat.stephanielamprea.com/uploads/1/3/0/7/130738732/sujamuzuk-lisizuxedir.pdf
    • http://files.makeuplocker.com/uploads/1/3/1/6/131636978/5036682.pdf
    • http://files.migrants.scot/uploads/1/3/1/3/131378999/1159745.pdf
    • http://files.lennysimagination.com/uploads/1/3/1/8/131857334/31c0a88.pdf
    • https://cdn.shopify.com/s/files/1/0435/4139/7656/files/5136440082.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/jagadasigobitolewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/70252462946.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/precalculus_with_limits_larson_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/wimivawunumirerisadu.pdf
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/corbett_maths_angles_in_polygons_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33540287451.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/dukara.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8274/files/razefakawizasezidikiwobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/application_of_forensic_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/52259931129.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b7.bin
b257192cf5617dc05081e6a0039cc2d9843d57c53b9ec56125a47fd1e5fdc930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 5280 bytes
font_01_sfnt_off0000798e.bin
26483523840052e874f4641ef8293029f08a2209fb91ae67df1e6e4d0f1fb8f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 10100 bytes
font_02_sfnt_off00009c27.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C27 4324 bytes

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