Malicious PDF — malware analysis report

Static analysis result for SHA-256 7187b030c78f8594…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 23:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21a27756d6abd1a69457c7a8bfbc7e92 SHA-1: 432bb3292d8673adc42a7a1912a220196a04800c SHA-256: 7187b030c78f85949422ce00f451d2aee0839ad352c08a1e7b702e511a5ebb25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to harmful content. The ML classifier also strongly flagged this document as malicious. The document body contains obfuscated text and a URL that appears to be part of the lure.

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=samsung+galaxy+s8+android+10+rom
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6465/6026/files/dead_code_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/coordinate_geometry_formula_class_10.pdf
    • https://static.usrfiles.com/ugd/77d535_b52cf734ff0b462d859d1aba4ae0bc22.pdf
    • https://static.usrfiles.com/ugd/b8c837_adac84e0dc6744afb4056eeeafe5fbc6.pdf
    • https://static.usrfiles.com/ugd/764aaa_99e1e3cfe3184189a880416130cb781b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c38de5975b04b90acc59398cf24a69a.pdf
    • https://static.usrfiles.com/ugd/b98abb_f58c71f2715e485da448285899229e0f.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0769/files/suvogudajuke.pdf
    • https://cdn.shopify.com/s/files/1/0447/8284/6109/files/bilbao_mapa_turistico.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/adn_polimerasa_3.pdf
    • https://cdn.shopify.com/s/files/1/0463/1858/3973/files/pokemon_game_download_uranium_version_for_android.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_off0000612f.bin
202614ea52871a3c43dc80699f4cd69540908867a5b03a8feb01fe2c6c09e9f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 5808 bytes
font_01_sfnt_off000074de.bin
88819ea55c3e1701be29c17853c84001c88d3b8386b60993973c438078ebc266
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DE 10548 bytes