Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec18b24f3db27ebe…

MALICIOUS

PDF

47.8 KB Created: 2020-08-02 00:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19c11ec3b756ec5ef44f71d4ad50aa7e SHA-1: 7c7e4d224927ba49f26d0374a32c7a2e8b36f293 SHA-256: ec18b24f3db27ebe8aa6b4a376f8b314bdaf8379b8be7bae8692674a19c2dad0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several other URLs pointing to PDF files hosted on Shopify and other file-sharing services, suggesting a link farm or redirection strategy. The primary intent appears to be directing users to malicious infrastructure via these links.

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=icthlarin%2527+s+little+helper+rs3
    • http://files.copyco.ca/uploads/1/3/2/7/132710753/1b5fe11043b.pdf
    • http://files.boxcarblog.com/uploads/1/3/0/7/130776795/lurerinen.pdf
    • http://files.hgbrga.com/uploads/1/3/1/0/131070398/namotigadososedulol.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/wozulikun.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/muvuxivunag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/lotakozosalanukoxali.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/41866749913.pdf
    • https://cdn.shopify.com/s/files/1/0437/3531/8689/files/79202688287.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/calculus_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/53375301687.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/napuzikavitisiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7017/files/nojilol.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/48437021101.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/28331263593.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/38246914256.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0732/files/kukopesimajivelar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cc7.bin
9ca43103bb744c0fa82c716048b1724aa827fbdcf575ea55d4dcf70b4babdf1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC7 5156 bytes
font_01_sfnt_off00008e51.bin
7a6e62a7a71df233ae745613ca2f866282716372423bcefdd7e492a71517b9b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E51 10644 bytes