Malicious PDF — malware analysis report

Static analysis result for SHA-256 666239c035543913…

MALICIOUS

PDF

41.4 KB Created: 2020-09-02 02:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb043e9e53fd1e485149fa78050d373 SHA-1: e4790d4bc1bd9b5ee5dd370c53e7df0e1a142dcc SHA-256: 666239c035543913921fdde5deb2ab41c0aa8c8173143fee2af213dcbff0e66c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with the keyword 'createspace paperback template'. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/wix?keyword=createspace+paperback+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0466/2630/8261/files/17910864022.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/tafazamurupikux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/5063431247.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/95515724546.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7210/files/55382313296.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/advantages_of_autocratic_leadership_style.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3420/files/2000_bayliner_capri_1850_lx_manual.pdf
    • https://static.usrfiles.com/ugd/c345b0_14fd83ec3ddc45a1aafb31c545608561.pdf
    • https://static.usrfiles.com/ugd/b8c837_85e1aaeea572428bad9bc86ed7fca052.pdf
    • https://cdn.shopify.com/s/files/1/0436/1243/8685/files/10530404177.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/kijowaleli.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/fobug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0992/files/journal_of_public_policy_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0447/0921/6409/files/demonstratives_in_english_exercises.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_off00006500.bin
068cac2d923a6a43d8162165050232d345a60b386ee7182f183a16cc7e5855a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 5188 bytes
font_01_sfnt_off00007686.bin
73ddb5830931e87111b2bbdc01ea22a5961f5cbce68a127cf8da3b20b519c40a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7686 10052 bytes