Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd0fba380493f2d…

MALICIOUS

PDF

67.1 KB Created: 2020-08-29 15:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28fffffdeb9b5a940a5f6de40e00b4b SHA-1: 5ffa5f75fd9ec2d8082de9c0e0ab4bbec99791aa SHA-256: 1bd0fba380493f2df114afcfef6259a9a5b9e4861a9be27818ae75aa1af35748
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=libros+de+computacion+para+ni%25C3%25B1os+de+primaria+pdf'. This URL is embedded within the document body, suggesting a social engineering lure related to children's computing books. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector indicates a likely attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=libros+de+computacion+para+ni%25C3%25B1os+de+primaria+pdf
    • https://static.usrfiles.com/ugd/b8c837_bbc3d5de0e87442d88fe43e4c6c1b80f.pdf
    • https://static.usrfiles.com/ugd/b8c837_597443141cdd4dd08befe21a0b7ad014.pdf
    • https://static.usrfiles.com/ugd/b8c837_d746cacea8cd4c9a86ccd86b9cf76171.pdf
    • https://static.usrfiles.com/ugd/b8c837_96ea950b4b9c49b88412f97053ec8fae.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cd1557c1c2947198157ca595f286777.pdf
    • https://cdn.shopify.com/s/files/1/0437/9390/7869/files/eclectic_approach.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/jupamosavo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/download_diblo_2.pdf
    • https://cdn.shopify.com/s/files/1/0461/7591/2090/files/iq_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/alimentos_con_alto_contenido_de_potasio.pdf
    • https://static.usrfiles.com/ugd/b8c837_76c144c1d3b7491aa1deccc89f04822f.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ac3bd222734e0d8b1566228a9cfecd.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_off0000c0cd.bin
7da2f123d1485b7086b6e87c4187543ec4ca99bbf53a89d7bb83a09b9e5e6f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CD 5564 bytes
font_01_sfnt_off0000d34f.bin
0aac05e288e237ecff1b09515d16114428b327d2a917e8bcf798c162665ee30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 13276 bytes

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