Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad0706e471d7e9d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 08:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 861dfb78044a2aa5f927bd64ffea0038 SHA-1: 8e4995e17fef4cfe33676746759efde2eb936b7b SHA-256: 5ad0706e471d7e9dba112e11ced55d58a3fee3726ea8dcf6cd8c56687de31e5b
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, a common tactic for SEO link farms and redirecting users to malicious sites. One URL, 'https://ttraff.ru/pify?keyword=infecciones+por+adenovirus+pediatria+pdf', is explicitly flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lead users to harmful content, likely as part of a phishing or malware distribution scheme.

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=infecciones+por+adenovirus+pediatria+pdf
    • http://files.katiedunivan.com/uploads/1/3/2/7/132741241/xugilirujazu_fatuvebizonosi_rikekijivokibof_zavonemewuvugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6984/0283/files/lexen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8040/8476/files/induction_of_labour_guidelines_queensland.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2435/8308/files/elcomsoft_ios_forensic_toolkit_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/zixosototikox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/xekalanuxolilamawog.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/variables_in_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0434/1111/2092/files/67882265565.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/believer_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/3213457786.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4339/files/foxit_reader_portable.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/verzion_wireless_rebate.pdf
    • https://cdn.shopify.com/s/files/1/0437/0336/9878/files/15391613309.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068c9.bin
c57dc9b76e99c5d12c3bbf4d32c770af4a4d6572fa39bb81c3fbede135d14119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C9 5116 bytes
font_01_sfnt_off00007a3e.bin
f55aaa75e1530d0b6a21244d1e8807891aa6959e9010ff8173b4a18549f7581b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3E 10140 bytes

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