Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d9abe6c94c4db…

MALICIOUS

PDF

154.7 KB Created: 2020-07-31 11:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9ae24ea15ae9e72b39aa23fe00a25f0 SHA-1: 4c33030f1170e08072c371cef12711336b429b4d SHA-256: 4d1d9abe6c94c4db0987632d401668641bfc58a2291b6f1f3526ea80793c2876
90 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The embedded URL `https://ttraff.ru/pify?keyword=active+and+passive+voice+with+answers+pdf` is the primary indicator of malicious intent, likely serving as a lure to a phishing site or a download host. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 2

  • 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.
  • 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.ru/pify?keyword=active+and+passive+voice+with+answers+pdf
    • http://files.winnparishfire.org/uploads/1/3/1/8/131872105/xaxetami.pdf
    • http://files.ellsworthffa-ffalumni.com/uploads/1/3/0/7/130776130/nilogitije_mibovusumapado.pdf
    • http://files.trevoultersouthdevons.com/uploads/1/3/0/8/130814208/vefejofewimupunilug.pdf
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/46520426181.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/sirapabixituzup.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/pegipepinomejibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/vosevunubebelimowofone.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/77408719426.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/jemoredebesilumagir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0436/7374/7609/files/92863605720.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0165/files/85828918488.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_off000225ae.bin
a5e30c1c6a2b8ec9518e273dd193329bb5a41a8147c9e2fe5e59035f7fb47d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x225AE 5140 bytes
font_01_sfnt_off0002372d.bin
ad356fca1977524abfe323b6479e0441b91c769052d59a0620696c3f4db98931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2372D 10344 bytes

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