Malicious PDF — malware analysis report

Static analysis result for SHA-256 c376d9d77ddefcd3…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 07:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1666b25330a5c53f579ed941aafbbb SHA-1: 187f430e48dac8604ba7f48755fc51e8dbf26888 SHA-256: c376d9d77ddefcd308e1fd8a56a954e17ec9c6bb17f7bc1dcc433133ce2f686d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'microeconomics pindyck 9th edition p' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=microeconomics+pindyck+9th+edition+p
    • https://static.usrfiles.com/ugd/b8c837_c91f7b46b6004e72a4e186cd9e11a7bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_90f3194e6bc64949924889cee6bf18be.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ed2aaded1c3425d813f5387c4679206.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/b8c837_0914cf91d1d74eb097ffca1d1712fcdc.pdf
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/centrales_trmicas_de_ciclo_combinado_teora_y_proyecto.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/the_hunger_games_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/materialismo_dialectico.pdf
    • https://cdn.shopify.com/s/files/1/0447/7750/4925/files/macroeconomics_mcconnell_21st_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6841/files/98985839044.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/59166352157.pdf
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/adobe_converter_free_download_for_windows_7_64_bit.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_off00006452.bin
d892d08eaee13e0895be3cff953d6f6ed1eb52142cb423be6c2bec57031a0408
pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 5400 bytes
font_01_sfnt_off00007693.bin
d2d64ab16319171f5c1860f05d7a63715a5215696be18e868192c8a341b3b402
pdf-font-stream PDF embedded font (sfnt) at offset 0x7693 10860 bytes