Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7a12d8e257ae5b…

MALICIOUS

PDF

39.2 KB Created: 2020-08-25 00:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccec4ae769346f0495c1a5ebef9d8ec SHA-1: 3a3e2236851a0a82a9e74e4b46dd7d8888346473 SHA-256: 3e7a12d8e257ae5bb42b8169e77f2a1ce29dbb1f0b914024c72f937b80377a46
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.ru/pify?keyword=yearly+gantt+chart+excel+template+xls'. This technique is often used to obscure the final malicious destination and evade detection. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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/pify?keyword=yearly+gantt+chart+excel+template+xls
    • http://files.northwestpermaculture.org/uploads/1/3/0/8/130873943/zexewije.pdf
    • http://files.grimoirtua.com/uploads/1/3/0/7/130775134/wujutasasizezo.pdf
    • http://files.brainerdbataan.com/uploads/1/3/0/8/130814531/222988fe5bbcd.pdf
    • https://cdn.shopify.com/s/files/1/0434/8651/1264/files/arere_avala_naguva_song_kannadamasti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/xisatuzopi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6539/0757/files/51635177851.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/13384357943.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/93266717667.pdf
    • https://cdn.shopify.com/s/files/1/0432/4212/7527/files/13336437302.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/mibowepoligiwuxefetaror.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/because_i_got_high_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/82167549268.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/jijuleridufidodemoxuva.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_off00005d14.bin
e59e14be7fdcd76652536e1db419669a3786ea2d5cd376b25684f0af527488f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 5476 bytes
font_01_sfnt_off00006f97.bin
5f008eb5b6f66cce71d83504fc0c9b9b8900f074f1144e1fb7010bf1b3898280
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 9504 bytes