Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ffa24187e405bb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-11 02:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b3123716efc7dbd82e0d3de1f4ab69c SHA-1: dcb62b1601b4867e675ef4d8df60a8167d7f5038 SHA-256: 74ffa24187e405bb4a711d7c08695b8471deea57e60dc433eb316f6290db46bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking URLs, suggesting a lure for users to click on the malicious link. The PDF_SEO_LINK_FARM heuristic further suggests this PDF is part of a larger link farm operation.

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=bluestone+alley+piano+sheet+pdf+free
    • http://files.yenzfacepainting.com/uploads/1/3/2/6/132682171/08048749a60.pdf
    • http://files.glyniskozmacoaching.com/uploads/1/3/1/4/131438329/kurag-zarim-nirizekififu.pdf
    • http://files.beckerpark.com/uploads/1/3/2/7/132712514/xuxukisoxoxeb_wupolamosafos_jawejukabodinax_fimaligamidiki.pdf
    • http://megim.pgoody.com/uploads/1/3/2/7/132712615/fopeto-dekirib-bikoripakurori-vegosaxib.pdf
    • http://files.ozarksridgecrest.com/uploads/1/3/2/6/132681390/kutinimogi_wuxezixa_zabujigazalono_xudife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/fijodamobuwunafowuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5745/files/33069416250.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3655/files/bulepeziviwuxiketesafever.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/85776056888.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/inayatullah_novels_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/3d_plot_python.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/bbq_recipes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/punisosejonuvirutokif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/65152969562.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f0.bin
64406e6c8ee0e29fab189c9008642cff16e7e6c78385d923f9a7b5de21defdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F0 5280 bytes
font_01_sfnt_off000062e5.bin
a3e424fd5691dd6805347605b4d8b7666ad9e5ee1a92979f1e1183bcf5aaa320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E5 15976 bytes

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