Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d0b81ce1500133…

MALICIOUS

PDF

45.5 KB Created: 2020-09-02 16:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26909efce902f164f7c813b08712f608 SHA-1: 980d0001a7c21f82d04b7fdd21bfd6611bd41577 SHA-256: 14d0b81ce1500133cc30b710e847f368c6f48b40b634c530124ec3fd35448b91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to Shopify-hosted PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL.

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.link/wix?keyword=beerappa+cinema+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/how_to_restart_bluetooth_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6781/files/nepefuxizomiwisosaxofo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1894/4665/files/biology_karyotype_worksheet_answers_key_karyotype_d.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1251/files/teamcity_rest_api.pdf
    • https://static.usrfiles.com/ugd/b8c837_4579e7ee784243c0a674461dea26c8ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.pdf
    • https://static.usrfiles.com/ugd/b8c837_3107dfe9b730412ba74a3e62a761ee0c.pdf
    • https://static.usrfiles.com/ugd/8ac1ab_10e52ce1e2354fe18bab4d853f04fed2.pdf
    • https://static.usrfiles.com/ugd/451a43_f66961613a344515852a91bbeb04a5bd.pdf
    • https://cdn.shopify.com/s/files/1/0437/4285/5319/files/9927859606.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/bangla_song_andrew_kishore.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/86365561510.pdf
    • https://cdn.shopify.com/s/files/1/0439/6492/4062/files/que_es_anestesia_regional.pdf
    • https://cdn.shopify.com/s/files/1/0438/9784/7976/files/95394818903.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006854.bin
4a93318ba19715799c77a730bcae364c6f0e24c403a6f69aafef8354eb48d7f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6854 5268 bytes
font_01_sfnt_off00007a2b.bin
95f26963b36aa72e079bc33bc12a4fac0e30b2756e4d17825a4eda47bd80fd5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2B 10192 bytes
font_02_sfnt_off00009d3f.bin
d5f36928e2f7a4d8dd0e407f35f8d77da06a3c38c432918666714aaa548685f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3F 2900 bytes

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