Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eed0eb228fa73eb…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 22:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fddbe9320bef4429673c8a5f010c0cdb SHA-1: c2772ace6c4c5114e6ec883249d94c6aa41d0b4d SHA-256: 5eed0eb228fa73ebb530d636f923314c2446e11332ccc56bf7dbc23ed96c8025
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one prominent URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to building a skateboard and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.com/wix?keyword=how+to+build+a+skateboard+manual+pad
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d94ae5_f397ab9c938b406c9272ff51eb1e6265.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1254cf299d44f93af00556eb2829e6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd7f8ff25d8455e83d95834c6718109.pdf
    • https://static.usrfiles.com/ugd/b8c837_990de314ea424f20a7631c03337610ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5e6b327d6874b65b00ada2bcfc807da.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/74381353990.pdf
    • https://cdn.shopify.com/s/files/1/0435/9539/9325/files/90745024286.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/sasixem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2165/5464/files/math_minutes_8th_grade_worksheets.pdf
    • https://static.usrfiles.com/ugd/b8c837_c339c8983be644e3b4c99bf180b96e90.pdf
    • https://static.usrfiles.com/ugd/c068f8_caedc8cf02b846ee887d812b08b45493.pdf
    • https://static.usrfiles.com/ugd/5899d5_aaf37463ffd349b5bd5889eb21b025c4.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_b3c984af157d4174b8eeb167647b3c82.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/zijolibudakikoverazo.pdf
    • https://cdn.shopify.com/s/files/1/0460/7134/9412/files/73001349592.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/90669112336.pdf
    • https://cdn.shopify.com/s/files/1/0440/3327/8102/files/shabarimale_swamy_ayyappa_kannada_song.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_off00006b33.bin
78cfe6595f485d2e7dff31a0fb398717a7158d8242e16a713efa4e81de5f7ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B33 5364 bytes
font_01_sfnt_off00007d5b.bin
ea1c24c97ec45d2cd998520df86723ed1c56ec8576c44e2e868fcc7f3d06ab8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5B 10536 bytes

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