Malicious PDF — malware analysis report

Static analysis result for SHA-256 237c5e55b32734fd…

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 11:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06287b0f44dbcdb4d6faaff863701ad SHA-1: 1577bae322c0ccdf40310fdca287a7d1fabbe98c SHA-256: 237c5e55b32734fd96dd29e571e61d154f67002fdfc189a502d40fd73482722e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One prominent link, 'https://ttraff.com/wix?keyword=national+geographic+reading+explorer+1', is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to lure users to potentially harmful content.

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.com/wix?keyword=national+geographic+reading+explorer+1
    • https://static.usrfiles.com/ugd/b8c837_5526e243182945e0b675c3dfb3d97af9.pdf
    • https://static.usrfiles.com/ugd/0aab01_9bcbaa5b13d241039f08f4bdcf2e3195.pdf
    • https://static.usrfiles.com/ugd/9e41f0_ee92f30d53874d90af7f4849853817ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_7093ddc8f9744b2aac5c360e0eaceeec.pdf
    • https://static.usrfiles.com/ugd/df4650_2d3d73f55ec14ee58b4940bae1548007.pdf
    • https://static.usrfiles.com/ugd/764aaa_8b40d78dc1344757b1cc13fd7272499e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d9ffaeceb504c518a6638ab40a23277.pdf
    • https://static.usrfiles.com/ugd/dd4472_14592dd205f5443d986089442b3871bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3fc20c6cc5443b78b1646e33f733bc0.pdf
    • https://static.usrfiles.com/ugd/8e1900_9c4a6207bab2433aa7d3d5c44b83011e.pdf
    • https://static.usrfiles.com/ugd/5b5da7_523415987c534a0ca4e5c0efe407b038.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/25302923606.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/millennial_generation_research.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/top_gun_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0469/9891/3176/files/amie_study_material_free_download_pd.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/17935710119.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_off00007d0b.bin
7777e1bc0d04c3941e8ad421200c056f8acc3ed51139b702b2bd65d3dc2e8710
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 5248 bytes
font_01_sfnt_off00008eda.bin
9593492bfa39a9017ffcdb317e27c7675554dbd9bd9102771cf14c68d0cb4fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDA 10748 bytes