Malicious PDF — malware analysis report

Static analysis result for SHA-256 8486144e47b9d2d8…

MALICIOUS

PDF

44.4 KB Created: 2020-09-02 09:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef23ed5ccd79c625d2abb8fd7f808b6c SHA-1: 1ec11e6e84d89a116ea50e9b1ca99ac17d05cf99 SHA-256: 8486144e47b9d2d805970375eaf8da8014232bb125de09863c6ae504eb3f9394
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://ttraff.me/wix?keyword=manual+calefont+ursus+trotter'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, suggesting an attempt to game search engines or distribute content. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the primary malicious URL.

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.me/wix?keyword=manual+calefont+ursus+trotter
    • https://static.usrfiles.com/ugd/b8c837_c87ea941250c487e8e6f9527c2a4aff2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ab1b82ed94e4ee587a8b5fe8d80a4df.pdf
    • https://static.usrfiles.com/ugd/f84671_ff4cb1d2fb2b47f3b495875248bb09fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2d59f632084276a5dc9f2cc36a11ed.pdf
    • https://static.usrfiles.com/ugd/9eb187_bd1c289a282d45978ef88926f7e0db6a.pdf
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/42735065632.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/sum_of_a_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/92060274095.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/adding_fractions_with_like_denominators_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/24557833883.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/brucella_abortus_morfologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/topop.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/32098125262.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/6652977151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006474.bin
221ddae8f58a8a7cf6a6350a678fe0fb689c55fd927e4104351f56f50a04a9f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 4716 bytes
font_01_sfnt_off00007480.bin
a7315ee23efe969e9f8fb880eba5151cd0f4ebbb75bf3e951169a143060eb497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7480 10076 bytes
font_02_sfnt_off000096ef.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EF 4324 bytes

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