Malicious PDF — malware analysis report

Static analysis result for SHA-256 15765716c97f642b…

MALICIOUS

PDF

48.0 KB Created: 2020-08-29 19:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16486982a2949d2a8bfeb20951390da9 SHA-1: c49db5aaacbb5919e0dda73fd05095d718b2d65a SHA-256: 15765716c97f642b56e6b7dc12b428b05e2343303556d39072b743cf2921307d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector URL. The ML classifier strongly indicates maliciousness, and the presence of a known malicious redirector URL suggests an attempt to lure users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

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=listas+de+cotejo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9718/4673/files/coconut_oil_soap_recipe_without_lye.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/baldomero_lillo_la_compuerta_numero_12.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/sejakemudusabawulexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/ferimukikujasis.pdf
    • https://cdn.shopify.com/s/files/1/0438/5705/1808/files/hvac_licensing_study_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_d89f4c1daefa4a51ba6be8fbc032956c.pdf
    • https://static.usrfiles.com/ugd/b8c837_62a5d968ecc846639d3de5cc1a6faf2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_97715f0395ef4dd58396046bfa7ab6f4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/vimana_shastra_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/luvux.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006623.bin
ef6ae4b6731ff38a39eba89b7865a200ce8189e55225297ea8f4bc68ac477eda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 4820 bytes
font_01_sfnt_off00007691.bin
8f46e3eb8a31665dbfe91998d74b8e09bcef62242d23ab0d29ebf0d101bccb87
pdf-font-stream PDF embedded font (sfnt) at offset 0x7691 12568 bytes
font_02_sfnt_off00009e8a.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8A 16144 bytes