Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c0b9d1806b1f45…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 02:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f957797926cdadffb251edd7ca39f65a SHA-1: 42a5ce79f374ed5120f32c2294da2ab19ae01aae SHA-256: 48c0b9d1806b1f4528db5b5288be1a5c805a74ebf5da0b03189bd2da47eee804
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, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=como+sacar+el+numero+de+protones, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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.cc/wix?keyword=como+sacar+el+numero+de+protones
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/preschool_alphabet_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/39711370898.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/tesunesusasupesoluv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/fevazogumami.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7218161301.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/zupusiro.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/zudimosunupojetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/57771071788.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/sedentarismo_segun_la_oms.pdf
    • https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.pdf
    • https://static.usrfiles.com/ugd/a107db_239e23274b214541bc053188e3fa44c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_25204655f552469babcc728c7980d808.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/bojigagedisojimeta.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/6385502839.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/15756467913.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/from_inquiry_to_academic_writing_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/71460597692.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_off00006a21.bin
11b63caa5c76c71e66a26bf46add14da507bd3c8f1a69be075f03ab3d8894a99
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 5124 bytes
font_01_sfnt_off00007b71.bin
24e8d9e632b3a0965f46b114ca96518ff837a849ca98b2107492ba3c85e2511e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B71 11144 bytes