Malicious PDF — malware analysis report

Static analysis result for SHA-256 0425c14dcc8b5cc6…

MALICIOUS

PDF

35.7 KB Created: 2020-08-29 00:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 391d5ba2d4dfd491782be9a428c2b2e2 SHA-1: 5adbf95e32b3aaec37419da517365aaea38c6dcc SHA-256: 0425c14dcc8b5cc6ad1bf224094569a911d28f9b11ee889453115322e942343d
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 SEO-optimized PDF documents hosted on external sites. One of the primary links directs to a known malicious redirector. This suggests an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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/wix?keyword=miss+awful+summary
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_16ebe99b704746ec9d98455de98a22e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e91c8ffad224240b9b6ae6b2fc36491.pdf
    • https://static.usrfiles.com/ugd/b8c837_a070c81b71a24ae6b21dd10e15ed75aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f45ee15d0da44aeeae51d85a94ec3e0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_45d127f7681548068b15fb56c7872518.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/87649084480.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8018/files/vertebrate_animal_classification_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/1507/6002/files/retifuponalikilijadedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/xubomut.pdf
    • https://cdn.shopify.com/s/files/1/0435/6174/6595/files/60700398388.pdf
    • https://static.usrfiles.com/ugd/b8c837_054f7823701d4e72b3a7a00e0b0ad30f.pdf
    • https://static.usrfiles.com/ugd/b8c837_115748a129394b8687d7017c60d30874.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c5064a05d2f46b4ac596c50e7c9ba93.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0deb1a4376a435e96ca0521b9232cbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_93879a5317f44462a68c02a82ce7a5da.pdf
    • https://static.usrfiles.com/ugd/b8c837_e91ff4138f344b0bbd5ffb5a6cf491fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3cfe0583d54cd0b63d2ef6556a1ace.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_off00004fab.bin
c0b3c243ff9cf5dc652de64604958908f74659636fd3909274b335994b039b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAB 5112 bytes
font_01_sfnt_off00006116.bin
91a14fd7f00cee01fc1f6073651aabf8e2a333fbee1d9f35ff25c3ac1f9239c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 9724 bytes