Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a1cfd180c691ca…

MALICIOUS

PDF

44.7 KB Created: 2020-08-23 04:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f10efb8835378121e2432b9e4cdaca2 SHA-1: 8cda419002716edb7fece933760d41ddb7ab2e3b SHA-256: 11a1cfd180c691cae49e7485c0075f18632bda2a3687ff43ad75624c0ba35553
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to generate SEO traffic, with one prominent link leading to known malicious redirector infrastructure. The presence of a 'download button' heuristic further suggests a lure to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm activity indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=all+bollywood+song++bestwap
    • http://medeliwu.annmartin.co.uk/uploads/1/3/0/7/130775257/gixefalob-natawoguvabomil-ligerugalawu-noroxedodozefe.pdf
    • http://zunogo.bcarterartanddesign.com/uploads/1/3/1/8/131858530/mavof.pdf
    • http://files.blnetworking.net/uploads/1/3/1/4/131437671/nagivenexodisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/xivurujimeruzaxufifigusos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1194/files/jetibuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/jodejedekixatoranavamowin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/45967012176.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/50468773999.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/77134241790.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/37359093930.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2629/files/60915204538.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/75967337289.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/nemabisupitet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/4549753103.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/moboluwuwadi.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_off00005bfd.bin
35368ed3b4cb22475638c114eef65ed95d911df90a50f8b074ad276dfb4d5533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFD 5352 bytes
font_01_sfnt_off00006e55.bin
b185ffd647233956f1717a40a90817525983bf52a56230e394bdcb7df2059507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E55 9948 bytes
font_02_sfnt_off0000909b.bin
bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x909B 16168 bytes

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