Malicious PDF — malware analysis report

Static analysis result for SHA-256 51259ffdbd96cf1d…

MALICIOUS

PDF

50.1 KB Created: 2020-08-30 10:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa19aabff9e3b6016fdb1c7d6c0ed6b5 SHA-1: 930a0771f5466aeae814a6697b57b01ac06301d8 SHA-256: 51259ffdbd96cf1dd0aa5bd2d144e1b050acf47f9563376d1aaaa3bc284f7eb4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Jim stoppani shortcut to size pdf' and the URL itself, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, and the primary malicious activity appears to be the redirection.

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=jim+stoppani+shortcut+to+size+pdf
    • https://static.usrfiles.com/ugd/d78803_ce21ade777c941e58e8e9dad4019d887.pdf
    • https://static.usrfiles.com/ugd/b8c837_b22a068bcf0949e3abe4af7e7f038f4d.pdf
    • https://static.usrfiles.com/ugd/565485_bfc9f208c1a64289836ab51b9d80bbe7.pdf
    • https://cdn.shopify.com/s/files/1/0439/0636/7656/files/lutujome.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/carmilla_libro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/goals_for_2019_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/karekkl_saylarda_sralama.pdf
    • https://cdn.shopify.com/s/files/1/0433/5114/6650/files/sinudomuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/kabipazolome.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/libivose.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/creepy_minecraft_skins.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/gujarati_calendar_2020_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2933/files/apr_performance_front_splitter.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/naruvoduda.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/96811005347.pdf
    • https://cdn.shopify.com/s/files/1/0433/6015/7855/files/didunowaritadulibedewufok.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c7e.bin
c7beea479e752ae3f326969fb8d9779fc1e1543e116722d2062193d6c444b384
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7E 5404 bytes
font_01_sfnt_off00008eab.bin
ff9f3e92c8e5b48172900528103a1cd318f4b632d13033b64c74bf120338a446
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAB 14300 bytes