Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a58bc3e868f7687…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 19:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d627736bed3f86048133f63df6d47894 SHA-1: 2139c13a6da758d759374bbd21494c7e716e6240 SHA-256: 3a58bc3e868f76877714a754035ee594a24576c87247258680754cead1e81aad
152 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body suggests a lure related to a 'Jeppesen instrument commercial manual', which is likely a pretext to encourage users to click the embedded malicious link. The PDF_SEO_LINK_FARM heuristic indicates a large number of similar links were present, suggesting a campaign to distribute malicious 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.cc/wix?keyword=jeppesen+instrument+commercial+manual
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/cadillac_escalade_2020_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/anesthsie_pridurale_technique.pdf
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/sarumomoximevurux.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa9ca426d15349f3a5bc093628f85eeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd37bedc790b417884464929b6788d9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_e29708be502f42099aadc15b0e736f8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_900e578656124c4381eb5500e85ce376.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a7ab4fa13ef4a3381c92a1aa9ddd512.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e2d96e8b664eca90f671195c5a7cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d86b7417ca4d8ea362872ef1700ea5.pdf
    • https://static.usrfiles.com/ugd/856cea_ed6e4ba17c4a40bdb87ac0d66f7fae59.pdf
    • https://static.usrfiles.com/ugd/b8c837_08f2c66cf1884957a9fb6140aa433033.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/vanenotonoruperoden.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/buvijanomawo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f19.bin
906b76a1833afa4dc7cabcf9f41e57553bb9515018a86d79d87299f8b687c247
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 4952 bytes
font_01_sfnt_off00006fca.bin
1c36a9aa36730c325756e7bdc35fe01f3f7564893f97e7aa98a5e82cea693c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCA 10652 bytes
font_02_sfnt_off000093bf.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x93BF 4324 bytes