Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfde5a3399547aa…

MALICIOUS

PDF

107.3 KB Created: 2020-08-21 16:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaad3d470c3153c27bdc676b516168a7 SHA-1: 878e598a2d02945d6039fddcf5d9e4398f44bae0 SHA-256: 5dfde5a3399547aa407d2cbba76693b69065d204f9f0df3d408ec30f2e40e6c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with a critical heuristic identifying it as a PDF link farm. One of these links, https://ttraff.ru/pify?keyword=canonical+b-+form+dna, is flagged as malicious and likely serves as a redirector to further malicious infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the nature of the link farm suggests an attempt to direct users to harmful content, potentially as part of a phishing or SEO-based attack.

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.ru/pify?keyword=canonical+b-+form+dna
    • http://files.humanesocietyofaurora.org/uploads/1/3/0/7/130776714/21b8d8.pdf
    • http://zegonezal.admarc.com/uploads/1/3/0/7/130776255/f0660d66371.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/fejafuzozewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1193/files/9936813365.pdf
    • https://cdn.shopify.com/s/files/1/0430/0220/0223/files/hundred_square_worksheets_year_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/sitovexufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/99057408008.pdf
    • https://cdn.shopify.com/s/files/1/0440/9524/2392/files/92991077086.pdf
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/venonud.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/xurabexuvusufajutez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/meridif.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/88328918335.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014875.bin
dc1415584ed52a9490c2721de6a216612afe9afc4c42e633f3a53cce024e0aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 5068 bytes
font_01_sfnt_off0001599a.bin
da79963fb097d6b4989140d9b6a851c12c2f60cfc3a923b4254ca79a98bca500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1599A 15728 bytes
font_02_sfnt_off00018b10.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B10 16148 bytes

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