Malicious PDF — malware analysis report

Static analysis result for SHA-256 804b64b309516393…

MALICIOUS

PDF

74.0 KB Created: 2020-09-07 13:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21df2cf895dceb2e9b6ae723dbb85ec0 SHA-1: d77ad0fea5a7ab258772e0e620bc1503ad7274f6 SHA-256: 804b64b309516393cb1485a9022c8e80ef0c39cd4d02dbee4ccea8c8d9aa55c6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=bacteriologia+medica+pdf', likely leads to a phishing page or malware download. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier strongly supports the malicious verdict.

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.link/wix?keyword=bacteriologia+medica+pdf
    • https://static.usrfiles.com/ugd/564d2e_b45ca4a9bbc64749a5d9a9ecc0f39fe9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce165cd67ae64a659f15c55cebf987d1.pdf
    • https://static.usrfiles.com/ugd/61b8bf_0a49e7db4c9f412cbb094a8a762b20da.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ba4d94663945188c53ab2d047448fd.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/1690165338.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/70533840920.pdf
    • https://cdn.shopify.com/s/files/1/0437/4629/5959/files/89_as_a_fraction.pdf
    • https://static.usrfiles.com/ugd/0e6328_fc2d16a4ee984d3d9ee0c287fe7bd65e.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_b83bc33002e54ae0b318da7c8b601486.pdf
    • https://static.usrfiles.com/ugd/ce4b7c_3e41210bc07d47268e0efe38d5029b57.pdf
    • https://static.usrfiles.com/ugd/868f76_f5ac264137574156ae03ee7893879234.pdf
    • https://static.usrfiles.com/ugd/72216b_84dbd6bba0d74ef6b5081b749cf052a0.pdf
    • https://static.usrfiles.com/ugd/99a8f2_4ee09a4454544a70814dda68f158ec71.pdf
    • https://static.usrfiles.com/ugd/735424_5ac38b7c79d340a9940d4516a0bf9b34.pdf
    • https://static.usrfiles.com/ugd/405339_fdc074ccaf5f4254b64d8f717d3176a0.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23a.bin
1f09512c08abd246b7ea813615bc396b5e3d77a917c17fc16c5948d2be54a02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 5028 bytes
font_01_sfnt_off0000d355.bin
8eb0b333506b2a119995269d1c14b569aa2946276ffbcb2247249726a4288443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 10652 bytes
font_02_sfnt_off0000f7c6.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 16148 bytes
font_03_sfnt_off00010cbf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 4324 bytes

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