Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fca6a617381fbf7…

MALICIOUS

PDF

46.1 KB Created: 2020-08-18 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d14ba20d3b37de88fb8a0e9fb0a6b4 SHA-1: 929298c5ddc4a5d473aa4fcc6aab6da937afd5dc SHA-256: 5fca6a617381fbf72baf91544ec08be3c5e1a5f45ad21fc5d1cbb7907ac388e0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=seventeen+change+up++matikiri'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm strategy points towards a phishing or redirection 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.com/pify?keyword=seventeen+change+up++matikiri
    • http://nowalozev.lcassociation.org/uploads/1/3/1/4/131437792/gibub-kunivugem.pdf
    • http://files.imryanwalker.com/uploads/1/3/0/7/130738507/gejagar-xivipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0337/1935/files/calendario_serie_a.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/88118774242.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/tamil_dubbed_biography_movies.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/migal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/mefewuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/93631905824.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/lajabod.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/ruxabizite.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3764/files/math_8th_grade_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/83997480880.pdf
    • https://cdn.shopify.com/s/files/1/0437/4423/1575/files/tamupafotexukupasur.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000581a.bin
1ac8c8e368689942efe7b786dee96f85683c880537bf76bdaf811e9c6e2c2c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581A 6880 bytes
font_01_sfnt_off00006ee4.bin
963d09fb9a03d6bda141f8b1e946c61a696e9c1a7565e84953c5daf4d70452e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 5364 bytes
font_02_sfnt_off000080fc.bin
d1fea7903176f133d6cfa0a3bccf4a695d4d41bfe53dd30389f5e91925293041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 13324 bytes

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