Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c5af1405ad95ad…

MALICIOUS

PDF

44.8 KB Created: 2020-09-02 00:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfd31b9dcb98aee5a2bcbbad6171ec7e SHA-1: f9bfec1773b6655bcd002a939a78df53202c6030 SHA-256: 63c5af1405ad95ad66229e198836673089e3f9b8b9693aad84dabe8d6f3b078b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.cc/wix?keyword=alcatraz+visitor+information'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=alcatraz+visitor+information
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7483/7918/files/79956640824.pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0790/files/kofarujimo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/71302342539.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/digital_electronics_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/91971964756.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/64659230446.pdf
    • https://cdn.shopify.com/s/files/1/0437/3335/2609/files/descargar_geometry_dash_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/gosekisumawekugipob.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/wepibonerarafirabizukabav.pdf
    • https://static.usrfiles.com/ugd/83b1b3_7d5792d4dc3d4f72b17c62b0d1f625c8.pdf
    • https://static.usrfiles.com/ugd/d954c5_23ed96ad10064c9b91a73fcf875daef2.pdf
    • https://static.usrfiles.com/ugd/b8c837_34fa6af42e7b403eb7b92b7bac34a2cf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006609.bin
81cdfed17c780902db88f792d030e2fd4b83bbdc33df0330521bf72b803ce10d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 4796 bytes
font_01_sfnt_off00007631.bin
3bf63b913f43e797250c5af7d00481d1aab8cb0cf7433a54a532e0a794afca25
pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 10064 bytes
font_02_sfnt_off000098b9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x98B9 4324 bytes