Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3f8df2204640f4…

MALICIOUS

PDF

50.9 KB Created: 2020-07-27 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f033f03eb0d04d1dc618c38d1293659e SHA-1: 68789ca6458d64cb1e093f680e8af52f2af3a5bd SHA-256: 5c3f8df2204640f45560411415201a5f5bf48e6e12e8f5510923ccc3e30d2a16
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are designed to appear as a list of movie websites but actually lead to potentially malicious infrastructure. One URL, 'https://ttraff.ru/pify?keyword=top+10+kannada+movies++websites', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=top+10+kannada+movies++websites
    • http://files.bradyrourke.com/uploads/1/3/1/6/131637226/3322073.pdf
    • http://files.thewindingsheetoutfit.org/uploads/1/3/0/9/130969826/f3dda.pdf
    • http://files.groveparkstudents.com/uploads/1/3/1/4/131455463/84ff04a.pdf
    • http://files.body-dynamic.com/uploads/1/3/0/8/130873908/16187bc2ec019f.pdf
    • http://files.lakotaconsultingllc.com/uploads/1/3/0/7/130740211/5279487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/97667219811.pdf
    • https://cdn.shopify.com/s/files/1/0429/0278/2111/files/23976110488.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/rutugimevalugosibaludaxav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/24715083037.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/47267851447.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3467/files/vosez.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/korotipidovixuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/barovapolarizejaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/sagegoborus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/56473630103.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/norozin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4640/files/32585626207.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_off000074cc.bin
d666a92816f2e30c6dfbcacca9ccc78e0be31334807d21881a7a4fb3175c1340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 5264 bytes
font_01_sfnt_off000086a8.bin
2277c5a8f95357f7564926827ae4d2a99f9518c987ffb8d81913a90d06e47a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A8 9900 bytes
font_02_sfnt_off0000a8bd.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BD 16164 bytes

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