Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c408ac230a47b5c…

MALICIOUS

PDF

48.5 KB Created: 2020-08-17 01:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec587876ecb73225b062f1e3d9b8e3f SHA-1: f956d879c08179ef591566e5a45cf5dc1da75b1c SHA-256: 7c408ac230a47b5cf47614035bb4ce07d6a937465ac73ae2d00ec1ee3a0cddda
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link pointing to a malicious domain, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains a URL that matches the redirector, indicating the primary intent is to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=emulator+for+playing+pc+games+on+android
    • http://nidegitew.greenharboryc.com/uploads/1/3/1/6/131606279/lilimigaxewim-xupavuwizode.pdf
    • http://files.sclegendsvbc.com/uploads/1/3/0/8/130814529/lasijuroduzax.pdf
    • http://files.villadelphini.com/uploads/1/3/2/8/132814306/jerino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/pokemon_soul_silver_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/65945384794.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/80391942499.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/free_expense_report_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/12501074494.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/fapafubilofogebaxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/81806378564.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/bebop_2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/93695400083.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_off00007f98.bin
ecd5b6ad00e5156377fb32ecb9db75e04a08973a83c88f5f1a6fac38716897d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F98 5532 bytes
font_01_sfnt_off0000925f.bin
90702b35a24e54c265c68029a69082ce96fdba13d88dc77f67331fce3f5e4a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x925F 10060 bytes