Malicious PDF — malware analysis report

Static analysis result for SHA-256 781f271669f7ee1a…

MALICIOUS

PDF

45.5 KB Created: 2020-08-23 13:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d63fbadff684839978abdbc3388b089 SHA-1: ccec5190572763515a0254bf7f3191624b7123e5 SHA-256: 781f271669f7ee1a84ecca3f2fffa54ebaa5a06baa17781631f8e8e9e445f384
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, potentially leading to malicious content.

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.ru/pify?keyword=formal+imperative+of+fare
    • http://files.julievanbenthem.nl/uploads/1/3/0/7/130739081/lurizetujemibotomos.pdf
    • http://files.sharingfamilymemories.org/uploads/1/3/2/6/132681443/kulowagomages.pdf
    • http://dedotamo.thermosenselab.com/uploads/1/3/0/9/130969481/e5994d65ce541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/9325281061.pdf
    • https://cdn.shopify.com/s/files/1/0440/6771/7270/files/6120934402.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/15709077326.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/streaming_software_for_android_box.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/55094329368.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/61978741596.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4439/files/gitajib.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/pivalonamitapiwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/zenuzuzeziparuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/73120394869.pdf
    • https://cdn.shopify.com/s/files/1/0463/0754/1157/files/10200447321.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/chemistry_final_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4423/files/gofigupavekovoxipixodide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/bolt_thread_conversion_chart.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f54.bin
a07c48587bd419500064fed960b67a6e75c30acf126b903cbf340b765769ff84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F54 4884 bytes
font_01_sfnt_off00006fe0.bin
c976dc96a83f1defcd1eebe97485286a811f901eae639c3c2a3ae648810fd778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 10240 bytes
font_02_sfnt_off0000930a.bin
329e287c3797ed234b758188ff9aaf1d7a443f7e5eede23d86ce69fdc486f8d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930A 16392 bytes

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