Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f432b76885fa30…

MALICIOUS

PDF

32.8 KB Created: 2020-09-01 13:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f306747bc0fd4fa44c9af90156eb65e6 SHA-1: 23b7525b0ec6ae2e48de009fd45f095a7c284bea SHA-256: 00f432b76885fa30f264a5c0bfdb49ba1c25792f6c88e9c9070c6ed03bd7d708
154 Risk Score

Malware Insights

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

The PDF document contains a mass external PDF link farm, with the primary redirector URL being https://ttraff.cc/wix?keyword=atys+3s+pdf. This indicates a social engineering attempt to lure users to potentially malicious content. 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.cc/wix?keyword=atys+3s+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a2c2bc_dd62bc2dea584867ab13c3942e525dfc.pdf
    • https://static.usrfiles.com/ugd/cdb50c_d81f4acecc704ffaa60b34241749fd9f.pdf
    • https://static.usrfiles.com/ugd/b65acf_971753a08c1040e19f0e554580ccd428.pdf
    • https://static.usrfiles.com/ugd/29c71c_68304951b1dc458baac4fa63955df65f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9150/9919/files/adding_and_subtracting_decimals_worksheets_common_core.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/batman_arkham_origins_apk_unlimited_money.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/biology_notes_for_neet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5139/1907/files/11088521148.pdf
    • https://static.usrfiles.com/ugd/b8c837_350ed67898fa49bc8ca490459bc7a8c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2e5d2036c146418585a26300aef531.pdf
    • https://static.usrfiles.com/ugd/b98abb_8491c35552d24633b7139ff07bef2fcb.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/fafotuzog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/69680246195.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/mitekexonok.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_off0000485a.bin
542d1fd7d41992657cb58de412c25b300258c7f8fcb8417673b5ed43ba3b6e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x485A 4952 bytes
font_01_sfnt_off0000595f.bin
cab1c34942f772eefccd463185e8187591dc97a435e02300dbc7039be916d451
pdf-font-stream PDF embedded font (sfnt) at offset 0x595F 8720 bytes