Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec194aec87641ca…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 03:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93a56db625c3a4d8957d43849dbe5672 SHA-1: becac5d9fccae7a9909dbb8a682e293144309a2e SHA-256: 6ec194aec87641ca73e85c86ea25d190ff02ce26bac0a6f6dbfb6dcc9ed8db9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious indicator is a link to 'ttraff.cc', which is flagged as a malicious redirector. The document body is heavily obfuscated and contains the same URLs, suggesting an attempt to manipulate search engine results or drive traffic to malicious sites.

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.cc/wix?keyword=university+of+iowa+cambus
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8b921cfaf69c4d6ab3c0c9fec767e3f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_519363adf93b474abd8e557ba937006f.pdf
    • https://static.usrfiles.com/ugd/b8c837_47e4f217def14a49a6bad2a3b6129161.pdf
    • https://static.usrfiles.com/ugd/6260fe_ca69ce7a0b774de5ad60b1f17b86091a.pdf
    • https://cdn.shopify.com/s/files/1/0439/0577/7832/files/e_collar_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0841/7192/files/dosis_ambroxol_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/abel_korzeniowski_charms_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2198/files/30516933316.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/blue_blue_eyes_song.pdf
    • https://static.usrfiles.com/ugd/7c3584_8377c28ffc6345a7a323c4d9fc909233.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4596a7deb9a4e2b80d4de45785102e6.pdf
    • https://static.usrfiles.com/ugd/5ad03d_03486a7e829c4868a3ca6272fbe1feb8.pdf
    • https://static.usrfiles.com/ugd/0df15e_45227fe0a7024cd39707981aeba23683.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/4121380110.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/zegovibubupekopaxiku.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/damulakatefokefin.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/advanced_excel_test_questions_and_answers_xls.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_off0000639f.bin
9f7f394248ee243fb791db2455949d4e0b259958246295b57c727d86d9bb360e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 5380 bytes
font_01_sfnt_off000075f3.bin
19577aad8a51f9eff977590a6abd7b18652245167e67649e356add1dff424b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F3 10128 bytes

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