Malicious PDF — malware analysis report

Static analysis result for SHA-256 657005e2a6a6776e…

MALICIOUS

PDF

40.6 KB Created: 2020-09-17 10:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88de4703f32bfedecad171fa0284c11c SHA-1: e5c60859804cd1ee0949ff6bfd6e1f4ce64768e4 SHA-256: 657005e2a6a6776e8d7b20ac9cfd6ef074a69818c514a5dce7193b852366f145
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of these links, https://ttraff.club/wix?keyword=the+open+window+answers, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure through a chain of redirects.

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.club/wix?keyword=the+open+window+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://20b64233-1e09-4c42-88c0-83f4b8956ff8.filesusr.com/ugd/2c8d66_4ca73d0f7b9b42f784a8b83b62d7ef7b.pdf?index=true
    • https://e0430fcd-33a4-4490-9e82-a412e1bb08db.filesusr.com/ugd/e3c460_25495d0557d04aab9b2001fd45989bc5.pdf?index=true
    • https://88c1c20b-371d-4353-8c45-6d8082e3a3c4.filesusr.com/ugd/5926b4_611c86a2eec341e6860fd1d794b231d6.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/2448/0416/files/rupozusukex.pdf
    • https://cdn.shopify.com/s/files/1/0447/4172/2263/files/preparation_of_alkyl_halide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/jijafiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/vifosuju.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/rejavululiwujuzakizale.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/94672654481.pdf
    • https://cdn.shopify.com/s/files/1/0463/0714/7938/files/blade_of_brim_mod_apk_revdl.pdf
    • https://fa5ac6a6-68c7-4882-a980-bc3f2eced65e.filesusr.com/ugd/135178_09570144b6d04d6a9b461184f078474b.pdf?index=true
    • https://70545432-771a-4e9f-bc2c-9ce55be819d0.filesusr.com/ugd/33ab24_05519f0568104230ba5b9ec0b47bb30a.pdf?index=true
    • https://54dec0ba-6c5d-48e3-8da7-72308760abd9.filesusr.com/ugd/ee4d88_0e4508d362d04042a3df1c374cc15ab2.pdf?index=true
    • 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_off0000612b.bin
0fe72f9ce4a74fa1cd5de95117b008558e54603859104569d23decee6a83964a
pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 5056 bytes
font_01_sfnt_off00007263.bin
1da739582acdd7423588b8b3e1fb7b448c7e29c761b98deaedc761084dd555f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 10376 bytes