Malicious PDF — malware analysis report

Static analysis result for SHA-256 663f2a2d5ed47159…

MALICIOUS

PDF

49.2 KB Created: 2020-08-16 19:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ef8310ba4ae3cc3f2d6e63446a363e SHA-1: 19239496ab80dea3fee2f019231ff2ea2d954779 SHA-256: 663f2a2d5ed47159ea8212c14b56efd17dbef178696394861d995bbd3557b1f6
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=julius+caesar+modern+translation+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to the Julius Caesar translation and the wkhtmltopdf tool, reinforcing the lure. No scripts were extracted, but the presence of numerous external links and a malicious redirector indicates a high likelihood of phishing or malware delivery.

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=julius+caesar+modern+translation+pdf
    • http://files.saintsugaroflondon.com/uploads/1/3/1/8/131871587/915e3.pdf
    • http://gefad.bigcreekkennels.com/uploads/1/3/0/9/130969742/387c9b5f5f07.pdf
    • http://bezotaba.doitallpressionals.com/uploads/1/3/0/7/130776485/55a095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/94268211947.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/30114024963.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/18646480139.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/42911263644.pdf
    • https://cdn.shopify.com/s/files/1/0445/6969/0276/files/62178248762.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/99604330046.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/descriptive_writing_practice.pdf
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/tutikirawedepaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/luvimudokafewevonekezifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4583/1324/files/69410293089.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_off00008168.bin
be92894b3bcc7907b8324ca17c425bfa382b0e1080f9b8959b3d7985a79179e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8168 5288 bytes
font_01_sfnt_off00009347.bin
1fcda8afb357de47c5652b42215db023829f9c24ee131ef16217ec1a0082c571
pdf-font-stream PDF embedded font (sfnt) at offset 0x9347 10600 bytes