Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdcbbe16d5c03a8…

MALICIOUS

PDF

40.4 KB Created: 2020-08-11 07:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb80c4eb0101e0d9fdc8b63c1e03bdc SHA-1: eb76784a36135e0d9f9a5d54996fc59d660e25b0 SHA-256: 8cdcbbe16d5c03a859d713b795f23cec44fbd5878d6c28e4598e5ac11af180b8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'animal anatomy books pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=animal+anatomy+books+pdf
    • http://files.radbren.com/uploads/1/3/1/3/131384635/mewixutug.pdf
    • http://vuzugano.generationwhycomic.com/uploads/1/3/1/6/131637136/7257357.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4242/1398/files/xosevesivepelasow.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4344/files/48451993978.pdf
    • https://cdn.shopify.com/s/files/1/0437/4783/6058/files/34757774501.pdf
    • https://cdn.shopify.com/s/files/1/0446/9827/1897/files/computer_hardware_and_networking_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/kurinasiwojowokavib.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/solid_converter_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6068/files/wirefewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/tanikabimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/xopuvuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/44223399036.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_off00006076.bin
bd816d3892f7882642867fcdd9e6be87d568182c07a87dbbea264909067a575b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 5388 bytes
font_01_sfnt_off000072b3.bin
7c43b1ed4c76f00a45d02d5ca1b983a26e46a971ec3ea70206439f30fb73e253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B3 10072 bytes

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