Malicious PDF — malware analysis report

Static analysis result for SHA-256 75096c689b2a6270…

MALICIOUS

PDF

43.1 KB Created: 2020-09-06 03:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93dcc4bb3a6a30c2da0096a6342c29d4 SHA-1: ef8011d16e79abb124c298823c0e2cd06bdfd734 SHA-256: 75096c689b2a62704b98849486954bc190ab655f59f124d8ca1ced42d32d589e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to seemingly benign PDF files, but one critical link directs to a known malicious redirector. This suggests a tactic to obscure malicious intent or to manipulate search engine rankings. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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.club/wix?keyword=best+manual+shift+cars+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_a245929504a444c6b1b6c2df20d37b56.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cf83f491a9749a1b00babc78116eb85.pdf
    • https://static.usrfiles.com/ugd/aec2ea_05f2177812084bb08bed3054e2976069.pdf
    • https://static.usrfiles.com/ugd/b8c837_e57810900aa64e4c94ebf406672e2a70.pdf
    • https://static.usrfiles.com/ugd/e5a943_4ef7b3d7287d482eacdb8250535c1c4c.pdf
    • https://cdn.shopify.com/s/files/1/0463/7104/5537/files/adam_booth_pensacola_fl.pdf
    • https://cdn.shopify.com/s/files/1/0447/2481/3977/files/fhm_100_sexiest_2015.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/pdf_editor_blogspot.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/pebefoxoso.pdf
    • https://cdn.shopify.com/s/files/1/0464/9114/0248/files/ionic_chemical_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8701/7637/files/basics_of_c_programming_free_download.pdf
    • https://static.usrfiles.com/ugd/2c8d66_bfbdd281b79a460f91d77971de3fef69.pdf
    • https://static.usrfiles.com/ugd/ea2f88_a254bbefb2bd4e08959cdc26e966fe6c.pdf
    • https://static.usrfiles.com/ugd/c81504_b8afd583498a47108f0cca511a09c31d.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_off00005d92.bin
c2951b438e0017160630e8bfa9e62d92975ea0b0fc5eff3003ff10e6bb326174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 5424 bytes
font_01_sfnt_off00006fcb.bin
09d7ac7fcf3922ed2bdb25987bc9f80dbe2441afe81f5b0febb6f1b71679d7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCB 9916 bytes
font_02_sfnt_off000091a7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A7 4324 bytes

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