Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dc240044bc9aac…

MALICIOUS

PDF

67.7 KB Created: 2020-08-31 00:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71e604652b3f83e1f997fb5e8c4c3496 SHA-1: 8495efbde66415ffbbc8177d2ee54eb3e6cafedf SHA-256: 67dc240044bc9aac18134608d7b3b359c92fb7d1bb243785849ce8d5a9c885f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous other links to Shopify-hosted PDFs suggests a link farm or SEO poisoning attempt to obscure the malicious destination.

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/wix?keyword=programme+de+calcul+3%2525C3%2525A8me
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/gosatekijuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/actualizar_app_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/ruzopapan.pdf
    • https://cdn.shopify.com/s/files/1/0436/6080/4249/files/niniwefajodenotix.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/zixemuguf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/74991996994.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/rigureruwejevet.pdf
    • https://cdn.shopify.com/s/files/1/0459/3241/3095/files/wagner_paint_crew_airless_paint_spra.pdf
    • https://static.usrfiles.com/ugd/79e5df_a12982ccf0cb4508a8ae4876ae2e81b5.pdf
    • https://static.usrfiles.com/ugd/9ea91e_096dfda8ad254d59a968b72b8e8d3b61.pdf
    • https://static.usrfiles.com/ugd/efb3f0_b72da9917d1e4f4b9bee0bfa9907d3f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_357b1d639daf40a4a9ae5e99878a32ad.pdf
    • https://static.usrfiles.com/ugd/edb4a7_0d2ff9f9ddf64e39bc772401d77c43ac.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_8af25043bd5c4abca618504f4a7e4c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_807a84efb84e4182b982a49ea297c8d8.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e5.bin
630af6d6572e9c211e6f744417db23292640c39281df96651ce7b2b4e187c561		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 5388 bytes
font_01_sfnt_off0000c5d9.bin
b74570c6ce14084ebd46a0bb743f2c3657df124921cd0a93a80319f760fc6e8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 11116 bytes
font_02_sfnt_off0000eb2d.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16036 bytes

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