Malicious PDF — malware analysis report

Static analysis result for SHA-256 24eab553eb1a66fe…

MALICIOUS

PDF

46.8 KB Created: 2020-11-02 13:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77172a3b5da379a3864dbff6062d347c SHA-1: 17c4e022f6c10fab603eb9f248fd27270fa9683f SHA-256: 24eab553eb1a66fee912c2e40b9c52e448d534b82ac76ed0c434fbade32f3acf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure known to host malicious content. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to drive traffic to malicious sites, likely for further exploitation or phishing.

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/123?keyword=bradley+cooper+news+today+daily+mail
    • https://cdn-cms.f-static.net/uploads/4426942/normal_5f9a7f0214fda.pdf
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f972059c22e5.pdf
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5f9d9cc18799a.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f89657271371.pdf
    • https://cdn-cms.f-static.net/uploads/4417123/normal_5f9ead490a6d1.pdf
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f9cd1dcd5571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0500/2654/5305/files/bivujak.pdf
    • https://cdn.shopify.com/s/files/1/0502/2197/3689/files/what_area_code_is_20901.pdf
    • https://s3.amazonaws.com/fifomi/nc_license_plate_agency_west_market_street_greensboro_nc.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/dewalt_radial_arm_saw_1251_manual.pdf
    • https://cdn.shopify.com/s/files/1/0501/9169/6056/files/46792621586.pdf
    • https://s3.amazonaws.com/henghuili-files2/tavizofeboxona.pdf
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/play_store_dark_mode_android.pdf
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/firebase_for_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0268/7680/5308/files/57545032864.pdf
    • https://cdn.shopify.com/s/files/1/0501/3232/0451/files/implementing_domain_driven_design_github.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_off0000746d.bin
9cbe2e7218f71c70d3fb3d5c9cd6ac5ccc62389da7c8c2783f0e8cab557ffa7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x746D 5464 bytes
font_01_sfnt_off00008707.bin
8ac49cf4afa2d0fc797207d49989b52f01731a0a840fc89e0bdd77e19396c658
pdf-font-stream PDF embedded font (sfnt) at offset 0x8707 11408 bytes