Malicious PDF — malware analysis report

Static analysis result for SHA-256 9808769ea8a8b9c4…

MALICIOUS

PDF

45.9 KB Created: 2020-08-10 09:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 158f55e5b43b1dff734c084a4807830f SHA-1: 95bebe0e6e631f4c9ba8cbf92a934ae346224441 SHA-256: 9808769ea8a8b9c4269d3dd483027d2fae3205f20720f6a4c77aba3eb7e825b5
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the same as the one identified by the heuristic. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly flagged this PDF as malicious.

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=diabetes+mellitus+ada+2020+pdf+espa%25C3%25B1ol
    • http://files.deschutesriverlavender.com/uploads/1/3/0/7/130776265/kofiw.pdf
    • http://files.61percent.uk/uploads/1/3/1/3/131398145/fiseporozeju-jujivaruwovuta.pdf
    • http://xivav.juneberrycottage.com/uploads/1/3/0/7/130738970/f24530ce87477f.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/88825820145.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/jnv_class_6th_admission_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/best_website_to_download_free_ebooks.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7234/files/98893590757.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/22060111354.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/cancer_de_estomago_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/53414282452.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/benim_hocam_eitim_bilimleri_deneme.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/63945955680.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/talk_like_ted_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/categorical_data_analysis_for_the_behavioral_and_social_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/catalysis_nptel.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_off0000605a.bin
2a69545f8a9d104697b847a0f548493cbc920d2d91a2c508c9ca03512f8941e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605A 6416 bytes
font_01_sfnt_off00007024.bin
4eb19132b235f2a26b2006f4922180e447e1e49111cca164f742ab4703680ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7024 5716 bytes
font_02_sfnt_off00008349.bin
7bc1233552fe3dc9499d7e6f149f21895ce3fae820125978a5cd834a807eca0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 10956 bytes

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