Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b765e842fec7b36…

MALICIOUS

PDF

52.9 KB Created: 2020-08-25 06:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a58e555dfcbdcf6e404b5670589608 SHA-1: 9b85f6ae32f63add22ac9ef820d4c05c6bd98a9f SHA-256: 5b765e842fec7b36ea27f11ad3315b2e0e18384fc6866d048c331f1cc587fa7d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'breast cancer fact sheet'. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded links and the redirection to a suspicious URL suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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=breast+cancer+fact+sheet
    • http://files.erinboake.com/uploads/1/3/1/1/131164452/e7d45194fa92c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/21230621215.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/8716273583.pdf
    • https://cdn.shopify.com/s/files/1/0436/0057/6669/files/7767785562.pdf
    • https://cdn.shopify.com/s/files/1/0433/5271/9515/files/49576650300.pdf
    • https://cdn.shopify.com/s/files/1/0430/8369/4247/files/cardinal_and_ordinal_approaches_to_consumer_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0440/4982/5942/files/halving_2d_shapes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/mitabujagokojatupigekedan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/lawolifotuvigu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/zozepenazaxumuxidakamub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/33088009196.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/adobe_premiere_pro_cs5_tutorial.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_off000085fd.bin
ecf72962b0f4cd77c0e7949c182aa28a706cf6537809a6e8d5a6afc88d50e245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FD 4616 bytes
font_01_sfnt_off0000958c.bin
2e75e76e7b3d0c8550901b5d66d87ee2dea98b4a35702dda9b89c9e10a42b142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958C 10312 bytes
font_02_sfnt_off0000b872.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 4324 bytes

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