Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1a8538da356c8b…

MALICIOUS

PDF

37.8 KB Created: 2020-08-25 08:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3f02b22fc0fcd4b90e12412fb6a32e8 SHA-1: c96141518f6a30db619dd5aaf8187c19e16b4808 SHA-256: fd1a8538da356c8b8a590f163c44c04a8481f544577ce37edb764d6ccbda2fc2
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link to 'ttraff.com', indicating a phishing or scam attempt. The document body, though heavily corrupted, contains the same malicious URL. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=the+bicameral+congress+worksheet
    • http://nawonew.a-1autoinc.com/uploads/1/3/1/4/131453724/sozavosijun-gizamugano-xaxusufuzevi.pdf
    • http://files.apexmiddleschoolpta.com/uploads/1/3/1/8/131872105/vutuxudesoxebexa.pdf
    • http://files.osgood-lagrone.com/uploads/1/3/1/4/131408930/duzirepola_fevinituze_mifamuxakat_fajazuvikufoso.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/wokixawopusararikubol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/66495315818.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/rurosuzofadubit.pdf
    • https://cdn.shopify.com/s/files/1/0462/6690/8834/files/84555754274.pdf
    • https://cdn.shopify.com/s/files/1/0451/4581/7253/files/think_bayes_bayesian_statistics_in_python_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8734/5304/files/13370010154.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/pebojalude.pdf
    • https://cdn.shopify.com/s/files/1/0462/9073/1169/files/word_story_escape_alcatraz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/78959259818.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_off000053be.bin
b69251654b2f13123867c806d836504e3a5511dee2d4e38e0c03c97c41df5924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BE 5456 bytes
font_01_sfnt_off0000663d.bin
e93cbb481516657c5e92fbcdb005883c425ca1f562f49e61ef619e59b79ecb1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 10736 bytes

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