Malicious PDF — malware analysis report

Static analysis result for SHA-256 1842ffd4d3890769…

MALICIOUS

PDF

42.2 KB Created: 2020-08-01 23:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b887ef871e03f02ac8dada51f7a40f SHA-1: 3a170d5eea04f94365c7cfa6228d5ea465a977b9 SHA-256: 1842ffd4d389076932c514c154048ab341ad985cb3dc9ba19dfb8c95b8a74f45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests the document is designed to funnel users through a chain of sites, likely for malicious purposes such as phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=big+dick+brother
    • http://files.natethehitmaker.com/uploads/1/3/1/4/131453541/kawokudupuwor-bumubutok-zepoxusikipur-rataki.pdf
    • http://files.demelloart.com/uploads/1/3/1/6/131636828/zubamasobamo_gomur_fuzonudep_dupuj.pdf
    • http://files.carolinedancewest.com/uploads/1/3/0/8/130814232/sidirukuwakezezafe.pdf
    • http://files.oicservices.org/uploads/1/3/1/3/131398221/1544479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/77758439579.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/moburobilisam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/navazofibagegigeda.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/47984661250.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44484222312.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujar.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/bopopedigasijodanig.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/19475954405.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2315/files/vubonudamegalisuduwufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/daluveruvojuxufetikamize.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/81061917980.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0437/6120/5399/files/83925022535.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a6.bin
23381595e27fc05dff8adb305f336eeca86883c5d89215c08601921d4f7ad7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A6 5032 bytes
font_01_sfnt_off000077ca.bin
0e501bf5e6afee11f9b22e2c905df947b7301051442b73541b15a63936074933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 10560 bytes

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