Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec75b09cefeaf78…

MALICIOUS

PDF

35.5 KB Created: 2020-08-29 12:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e800bb8cb9722c9b19bbc2c262261dd4 SHA-1: 1a6ceb4641155881821b6d997a1e0bd49e748d71 SHA-256: cec75b09cefeaf783cc2353d3c1d4efd511dfe495da635c006567e71a488a99b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One of these links, https://ttraff.ru/wix?keyword=luna+the+femboy, is known to redirect to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the malicious URL.

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=luna+the+femboy
    • https://cdn.shopify.com/s/files/1/0435/8170/2301/files/nakemakuzunugaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/wobazutavimiwiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/alta_performance_em_vendas_hinode.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/99943142737.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/fallout_3_pc_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6eba044e763446e97e044e59ea99c06.pdf
    • https://static.usrfiles.com/ugd/b8c837_5000b089e67f44d9981577ab7ba9da1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ea06ee8763242819b6ad57a77c297b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5394b67b6eb420ba181c0e7eca91549.pdf
    • https://static.usrfiles.com/ugd/b8c837_c75e09d646e4422e93901abf44122c72.pdf
    • https://static.usrfiles.com/ugd/704566_ac585c3c39c145858fc445504f13ffb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e4e2a1d621446939847d2da4ef603dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_77a28d23e4884018bdace19f74a42eff.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/98245343136.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/the_bible_old_testament.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_off00004f15.bin
4c80297da6c3d33ed19aa2b483ed8031b2028a58d2d2dccc4c9c87afa934a138
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F15 4884 bytes
font_01_sfnt_off00005f9e.bin
60d5856ae1944e56f8703f187d28b99fa4ad544ba24739daa8a718f0eae1f1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9E 10092 bytes