Malicious PDF — malware analysis report

Static analysis result for SHA-256 f247a019e5f64925…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 07:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 138376d0bdb8809564f5ad22a0f668ab SHA-1: 867684e15cf4126182c403c73e32120ce8e3304c SHA-256: f247a019e5f64925efe86926e58aed5bfc862ecddf956f5dcf0c9a0f0634bf13
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=o%2527+reilly+python+free. Another critical heuristic identified a large number of external PDF links, suggesting a link farm designed to manipulate search engine results. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the malicious URL and other URLs pointing to PDF files hosted on Shopify and other domains, likely as part of a lure to disguise the malicious intent.

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=o%2527+reilly+python+free
    • http://files.jazzphilosophyfusion.com/uploads/1/3/1/3/131382583/norujuj_tuwemolezipaf_ridevezovoteje.pdf
    • http://files.perfectlittleme.com/uploads/1/3/1/6/131607093/foborerukoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1970/files/vevugilowamofemeluroderif.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/anatomy_for_sculptors.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4668/files/angular_6_template_form_validation_on_submit.pdf
    • https://cdn.shopify.com/s/files/1/0465/5330/1150/files/zojepagidoxojexodofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/84670613723.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/chemistry_textbook_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/tokijakozasidiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/pazasubaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/beyond_the_lights_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0432/2453/1101/files/carpenters_close_to_you_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/kuletozolivotazez.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/tugavezo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681d.bin
3995a9f5312777fbb3dbe8e31c7241a9238f6db13864262018eac9a02de093c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681D 4764 bytes
font_01_sfnt_off00007856.bin
39b4c815653d173505458558ec5ecf9e97baa076510866fff9b770ad7413f385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7856 10092 bytes

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