Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d8e686c5ab183a…

MALICIOUS

PDF

38.3 KB Created: 2020-09-01 14:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eefd3228f97e834b9d4af28e6e8f7ec SHA-1: 2abefd92f4830a459a9296b9230b10eb7d14c6d0 SHA-256: 66d8e686c5ab183a7a9806f3e87ba56ff50a0e80a80d243eaf22ba0a9983b095
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, containing numerous embedded URLs pointing to other PDF documents. One of these URLs, 'https://ttraff.ru/wix?keyword=terraform+iam+role+instance+profile', is flagged as a malicious redirector. The presence of a large number of external links suggests an attempt to manipulate SEO or distribute malicious content indirectly. No scripts were extracted from this sample.

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=terraform+iam+role+instance+profile
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/93504181107.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/zalozole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9412/files/mikol.pdf
    • https://cdn.shopify.com/s/files/1/0438/3372/0992/files/74196716868.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/25793847663.pdf
    • https://static.usrfiles.com/ugd/89064d_40c64feb259d4f85a7960f1bdacad832.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e0f6f997bcb4a4ba617ecf9cb4b2ecc.pdf
    • https://static.usrfiles.com/ugd/67f5f7_b65b51c8b646406d98ac790e237391f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/625844_0b74deb1587942f588d3b81fbbdedf67.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c718861d0aa42f28b8f31c7e3617d2f.pdf
    • https://static.usrfiles.com/ugd/2e16aa_495865d307c24455b54a5aef62fe3423.pdf
    • https://static.usrfiles.com/ugd/b8c837_c44407b9b901460694c3080e5b5616a2.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_6c393549b9d54f4abd8e3d824be55e1a.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_off000057b7.bin
3de3746971ea8a6dfe0ce40cba2daf57246bf12f567ee6ea5b2eb0d3e0db4b1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x57B7 5112 bytes
font_01_sfnt_off00006905.bin
49240e7f8bcf6a6e68ea20958dffd8ce1b0505a5bb88dfe4e084696a81766e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6905 10428 bytes