Malicious PDF — malware analysis report

Static analysis result for SHA-256 351633d1be82b76d…

MALICIOUS

PDF

36.3 KB Created: 2020-08-25 07:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c3942cddab65b7f216abd246af21ee SHA-1: 1603d7e6d2e8fee768f8951be0fb6f6a89d5edbb SHA-256: 351633d1be82b76d95455820c5a64273922eac33802e16a3700da2a07083bdf1
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to its inclusion of links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=b+m+w+car+hd+wallpaper. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, reinforcing the link farm and redirection attack pattern. No scripts were extracted, limiting the analysis to the PDF structure and embedded URLs.

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.com/pify?keyword=b+m+w+car+hd+wallpaper
    • http://files.afmsupplements.com/uploads/1/3/1/6/131636772/virorobasugew.pdf
    • http://files.needforkeys.com/uploads/1/3/1/0/131071157/fujaxevekoxo-xopuvawuwa-lipafipuri.pdf
    • http://zafub.arboristabroad.com/uploads/1/3/0/7/130739163/ec150436d71.pdf
    • http://files.sabrinafaudarole.com/uploads/1/3/1/3/131378838/485141.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/67862347513.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/mamomivotaziranisadas.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/agumai_borgeet_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/encyclopedia_of_evolutionary_biology.pdf
    • https://cdn.shopify.com/s/files/1/0437/4872/0789/files/canadian_visa_application_form_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/stardew_foraging_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7637/files/surah_ar_rahman_arabic_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/49759639876.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3232/files/einkommensteuererklrung_2020_anlage_kind.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/6_pillars_of_self_esteem.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/lubegunumudenoxekusizadim.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/67404142933.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0209/files/.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6642/files/feasibility_study_report_of_a_software_project.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_off00005161.bin
5b3d2708b9b16f416564baecc880830778f1b7fc2184c050553acc6060ce0e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5161 5276 bytes
font_01_sfnt_off00006332.bin
5e7cae16b10cf33c28878ce0880dbe3519e55941648fa09e320c16484c6eccb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6332 9816 bytes

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