Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b084555177a4c3…

MALICIOUS

PDF

43.2 KB Created: 2020-09-01 09:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1d8b88bf9aec5f332eb29df490a495c SHA-1: 91658facfd5f101f8a5d5c9c27afe1aacfbbc460 SHA-256: 16b084555177a4c3d3ed9fa679961a1512d453246e3c59e33d42460753f334c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to potentially malicious content. One critical heuristic identified a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection scheme.

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=billboard+music+awards+2019+performances+paula+abdul
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/the_search_is_over_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/viwetijosinuzupebodizupi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/9740702790.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/vosedixexoxudisuridiko.pdf
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/10956225263.pdf
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/47143761603.pdf
    • https://static.usrfiles.com/ugd/de02f3_178b074743094681ae52e37b66d7a6e5.pdf
    • https://static.usrfiles.com/ugd/111c46_60feaad62676431586c30612ffef437f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.pdf
    • https://static.usrfiles.com/ugd/1b8612_cd7936342b3d4dea9dac6fe369ea1b44.pdf
    • https://static.usrfiles.com/ugd/5be868_7083630f42a44815837c1aa15eb346dc.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2974/files/human_anatomy_and_physiology_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7620/files/isaimini_cartoon_movies_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/zomixakumejekurax.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/50457397927.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/jideleg.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_off000066d7.bin
e506501893b32e0c80f42ddd5a378cfcb189d15dd1cd3f21bdbe0120b2852d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 6064 bytes
font_01_sfnt_off00007b79.bin
935827725572f4eba2310be956a519c999f55f24e63c245dc64c18564918a791
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B79 10616 bytes