Malicious PDF — malware analysis report

Static analysis result for SHA-256 28538d91a5d6890a…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b78e9a8dd1ace7ebf2eca19f812f1a94 SHA-1: 7f3f7701a1dcf6a77149df01b47730926995fd0f SHA-256: 28538d91a5d6890a05e83c1362835266fe88be1d2887e5ae5630e9e17d02f0f4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector infrastructure. It also features a link farm of numerous external PDF files hosted on domains like Shopify, suggesting a tactic to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is https://ttraff.com/pify?keyword=linea+base+ambiental+pdf.

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.com/pify?keyword=linea+base+ambiental+pdf
    • http://files.betsyleebaileymusic.com/uploads/1/3/1/4/131453215/fumuripaw_xofidirawekimu.pdf
    • http://files.myfoodpassion.net/uploads/1/3/1/8/131871705/nedalarida.pdf
    • http://files.bakshlab.com/uploads/1/3/1/4/131408172/donovurozodun_vepepapedesos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/33243808582.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/benuworopomisazutepawot.pdf
    • https://cdn.shopify.com/s/files/1/0439/4002/0382/files/80567644025.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/xawubapiguzoravawo.pdf
    • https://cdn.shopify.com/s/files/1/0444/3789/7383/files/acta_constitutiva_de_una_empresa_formato.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/manufacturing_science_amitabha_ghosh_and_ak_mallik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/measurement_worksheet_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/one_day_at_a_time_sweet_jesus_lyrics.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_off0000637b.bin
da7d32638678a0d2be0950e80b35b09f162f6cff2e2dd9ddbafcfff4429de1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 5172 bytes
font_01_sfnt_off000074fa.bin
f56adb65e8af42ef9292657fda783a4d1242ce396b77a4eacae5d2e993c7c4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 10280 bytes

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