Malicious PDF — malware analysis report

Static analysis result for SHA-256 4913763893eab7a1…

MALICIOUS

PDF

51.2 KB Created: 2020-08-10 06:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0abb3a86d5e0412993c7d55fe936f0db SHA-1: 39090d6e7a8a675ad6e1398b20679481ec3f9889 SHA-256: 4913763893eab7a181dfb63fa6866acfc324418b57003c787cf65585d8b4caf1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=yasser+seirawan+winning+chess+tactics+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=yasser+seirawan+winning+chess+tactics+pdf
    • http://xojopa.claytonbrowneortho.com/uploads/1/3/1/3/131380600/08eb000e.pdf
    • http://files.thepuredreamfortwayne.com/uploads/1/3/1/0/131069819/1585743.pdf
    • http://files.dallasoregonparks.com/uploads/1/3/1/0/131070309/7181850.pdf
    • http://files.yenzfacepainting.com/uploads/1/3/2/6/132682171/08048749a60.pdf
    • http://files.sonechkorentals.com/uploads/1/3/1/3/131379990/d5742.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/87577102286.pdf
    • https://cdn.shopify.com/s/files/1/0434/3824/3996/files/calculus_early_transcendentals_4th_edition_jon_rogawski.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/fezelaras.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/how_to_get_photoshop_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7147/0742/files/46449777848.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/95781189412.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/zikafogutiverikoposi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7641/files/jomebanitesijidadozosujov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.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_off00006a3e.bin
b03509b2ab21012062c032a8a830dcb87befa1bfb05ae5a7bb4df76df15831cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3E 5440 bytes
font_01_sfnt_off00007ccf.bin
efff37eb5032257e8d065af31d53f4f4c3b996747aa758a3042bdc4fcc805298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCF 14360 bytes
font_02_sfnt_off0000aa24.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA24 16204 bytes

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