Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdda6410272f0225…

MALICIOUS

PDF

48.6 KB Created: 2020-07-25 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d8d10e50a26be112d0c828dc920fbf5 SHA-1: 28114aa7ddd9722eff6f8ac7adeedb1486bb74bc SHA-256: bdda6410272f02251c7632f19182bf06ef300474fcd15b34c9d75b59570c2ac7
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=applause+formaturas+fotos', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure beyond the presence of links.

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=applause+formaturas+fotos
    • http://files.keepactiveosteopathy.com.au/uploads/1/3/1/4/131453045/2810178.pdf
    • http://files.nwarkansashomeguide.com/uploads/1/3/0/7/130776655/bazoke.pdf
    • http://files.christcentredchildbirth.com/uploads/1/3/1/4/131406610/kafel.pdf
    • http://files.aigrettesilkens.com/uploads/1/3/1/6/131606284/tasabikirodi_lidoniremozija_kununediwuxu_falanarefenel.pdf
    • http://files.aigrettesilkens.com/uploads/1/3/1/6/131606284/tasabikirodi_lidoniremozi
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/nevelitonununifezu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/58318523286.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/67889106277.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/74313079922.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/26317907007.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/jovejigezusudapetodo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/10146774329.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/vepeselul.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7447/files/5139006684.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/nopoxolelesewo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/bonanitelirigir.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/ziturada.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_off0000822c.bin
28d10b0be9bcdaf90f078214674c60729bdf49d1c87b8bf3f67bb8a0611e95ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822C 4764 bytes
font_01_sfnt_off00009262.bin
d0e1794b6aa8b251fb7cadc59a1fe8ce5c1e7c8ce33f90dddf110dbba8afcca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9262 10204 bytes

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