Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bf4a04ea636622…

MALICIOUS

PDF

47.7 KB Created: 2020-08-28 21:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9478c97443b59aee5d145178200900d SHA-1: 747bf04b6cdc8258b726d1f5472ddd9f89a1b969 SHA-256: 66bf4a04ea636622cd84e8b3ee13887bc217cd66e8b382714f77f233763a1520
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 other PDF files hosted on various platforms, forming a link farm. One of these links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=pedro+jose+marquez
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5646/3014/files/63927743382.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/dakedenimokuxuzotered.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7151/files/bozabudenar.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/repetir_yo_form_present_tense.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/31652439024.pdf
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0477fee2ee2e4f7086ad927eaeb3ddf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_590ecfa9c212456080d2cc9d8e5beffb.pdf
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/fraser_valley_auction_saturday_report.pdf
    • https://cdn.shopify.com/s/files/1/0464/6633/4872/files/daxetopofa.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d04c07f51e4303a0146d706689667b.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc3a2a58ac94b36bb8b3bdd4e5be681.pdf
    • https://static.usrfiles.com/ugd/b8c837_997ae683a9c349bf93a1d04be82e9c43.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007054.bin
e7715cc20cf83c8a7bab5cf4e3a20106b89440c78d948beca418f095155e4063
pdf-font-stream PDF embedded font (sfnt) at offset 0x7054 4840 bytes
font_01_sfnt_off000080c5.bin
dc4487c83742d30cc7bd6abc6219a9750cd0a41e2f75bb0f2c8533696a1fe4ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 10516 bytes
font_02_sfnt_off0000a446.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xA446 4324 bytes