Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6a5800f162493…

MALICIOUS

PDF

55.3 KB Created: 2020-07-30 14:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae40c16697b701136e3a2256b5bf20c6 SHA-1: 2ddc7b61c5a91d995974df44fb9c2c848caa808e SHA-256: 3fc6a5800f162493731fe369a4d4299b192d131456a56883d78914f5e90da2d1
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm, suggesting a tactic to manipulate search engine results. The ML classifier also flagged the PDF with high confidence. The document body text, though partially corrupted, suggests a lure related to 'mixed exercises PDF'.

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=br%25C3%25BCche+gemischte+aufgaben+pdf
    • http://files.palmamingozzi.com/uploads/1/3/2/6/132695457/tesiredumug-jenetof-pofopikutebuw-wafuvebotira.pdf
    • http://files.corriebeth.com/uploads/1/3/0/8/130813550/2821064.pdf
    • http://files.oui.sg/uploads/1/3/1/4/131454670/4396237.pdf
    • http://files.cristinaprilfrey.com/uploads/1/3/1/3/131379306/muvovobofuwazokok.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/nadudujufoxepadax.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/sovukun.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/liditawimarironudamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/21922771509.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/85541975432.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2053/files/73060815003.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/35372258950.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/jozoserufuvomuviwudilipe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/xedapefaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4343/files/vovodizedovup.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_off0000963c.bin
5e83fd08414a97fc3a2b0d280945565c9e0bc1d13bc1e18fd481979451593cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x963C 5620 bytes
font_01_sfnt_off0000a8fb.bin
838d84fe89c4d4b58dab39f0a72a9eaf3b5304783d7582eb60e92da1deff860b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FB 11296 bytes

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