Malicious PDF — malware analysis report

Static analysis result for SHA-256 c022644d0e08a21c…

MALICIOUS

PDF

50.6 KB Created: 2020-08-15 00:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d811d24ffeaa7b7d633b2698bdebde1b SHA-1: 822c47c356f4190f7aa0e8947dda4337f518a7fc SHA-256: c022644d0e08a21c40db5e76a3dee7afa2a889666aea7e6b5db700ab7f7d54c9
152 Risk Score

Malware Insights

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

The PDF was generated by wkhtmltopdf and contains a significant number of embedded links. One of these links, 'https://ttraff.cc/pify?keyword=air+masses+how+formed', points to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, many of which are hosted on Shopify but some point to suspicious domains, suggesting a link farm designed to lure victims. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=air+masses+how+formed
    • http://nubuv.tucsonhopshop.com/uploads/1/3/1/1/131164250/3775899.pdf
    • http://files.karenwellingtonfoundation.org/uploads/1/3/0/9/130969824/gujutewabogexi.pdf
    • http://lalexij.beachcleaner.com/uploads/1/3/1/4/131452903/1763755.pdf
    • http://files.talgolani.com/uploads/1/3/1/4/131438464/jutoziwutewuf-tibemiwitirijo-sadelatif.pdf
    • http://wewifow.therapistsmap.com/uploads/1/3/0/8/130814328/8530a706.pdf
    • https://cdn.shopify.com/s/files/1/0446/7671/0563/files/icse_maths_book_for_class_4_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7895/0810/files/73342360916.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/kosezimipulono.pdf
    • https://cdn.shopify.com/s/files/1/0451/1399/9512/files/ahad_nama_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/3720/0277/files/o_autismo.pdf
    • https://cdn.shopify.com/s/files/1/0451/3647/8361/files/atheism_and_theism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/rosuzirul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/54361377126.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/nazowot.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/63757083694.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_off0000717a.bin
5a5261f1af7484b92c63355a07ac7590dbb18682ba1630b52e2547528954948c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717A 5196 bytes
font_01_sfnt_off0000830d.bin
cc07b84b3e21dcf40525b6ea0b4cf9f1f59d790058de8c370cdbcf7de75e20cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830D 10496 bytes
font_02_sfnt_off0000a723.bin
4e33714b56110788a65b3ccccc86b33874f2ccf8e01c4b58923d0723bd0c6ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA723 16424 bytes

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