Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ebcd4d3ecfcc76…

MALICIOUS

PDF

50.1 KB Created: 2020-08-29 14:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8587d9e73eaa917f3d946fc3a852e7a SHA-1: 342e4d386cc9abffcbdfb5c83cbf31d16ee1ea19 SHA-256: 53ebcd4d3ecfcc767df92523b8392b12b198d73d7617216e230a945c34d95b41
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious due to containing a large number of external links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=michael+ende+la+historia+interminable. This suggests a link farm or redirection scheme designed to lead users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=michael+ende+la+historia+interminable
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/18248195117.pdf
    • https://cdn.shopify.com/s/files/1/0466/3227/2037/files/levantarse_conjugation_formal_command.pdf
    • https://cdn.shopify.com/s/files/1/0440/7289/4629/files/microsoft_games_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0459/6206/8127/files/autoharp_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/31523283398.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/20125073992.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/26637816124.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/nunofuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/59961911123.pdf
    • https://cdn.shopify.com/s/files/1/0436/9694/7353/files/83024554358.pdf
    • https://cdn.shopify.com/s/files/1/0440/3088/6053/files/babomibu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/dopoxukixetibiwejefug.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/aptitude_test_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/apeman_c420_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7114/files/22497254299.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_off000084ae.bin
f10513e141d828e13cf34ae884873c9f285144a9e2317841244a53bbae3a8593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 5324 bytes
font_01_sfnt_off00009691.bin
6d56cb799d61d2d7d9488d7da1d70fe54db012dcf18b98a7663a97b5eaf61b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9691 10868 bytes

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